1
                                EXHIBIT 10.10

                                     AETNA

    THIS IS AN EXCESS CLAIMS MADE INDEMNITY POLICY WITH EXPENSES INCLUDED
                          IN THE LIMIT OF LIABILITY.

                   PLEASE READ THE ENTIRE POLICY CAREFULLY.

                    THE AETNA CASUALTY AND SURETY COMPANY
       DIRECTORS AND OFFICERS LIABILITY AND REIMBURSEMENT EXCESS POLICY
                                 DECLARATIONS


                                                                   POLICY NUMBER
                                                          095 LB 100 844 655 BCA

NOTICE:  THIS POLICY, SUBJECT TO ALL TERMS, CONDITIONS AND LIMITATIONS, APPLIES
ONLY TO ANY CLAIM FIRST MADE OR DEEMED MADE PURSUANT TO THE TERMS HEREOF
AGAINST THE INSUREDS DURING THE POLICY PERIOD.  THE LIMIT OF LIABILITY  
AVAILABLE TO PAY DAMAGES OR SETTLEMENTS SHALL BE REDUCED BY AMOUNTS INCURRED AS
DEFENSE EXPENSES.  THIS POLICY DOES NOT PROVIDE FOR ANY DUTY BY THE UNDERWRITER
TO DEFEND ANY OF THE INSUREDS.

ITEM 1.   PARENT ORGANIZATION NAME AND PRINCIPAL ADDRESS:
          Bolt Beranek and Newman Inc.
          150 Cambridge Park Drive
          Cambridge, MA  02140

ITEM 2.   POLICY PERIOD:
          (a)  From 12/1/1994   to  12/1/1995
          at 12:01 a.m. Standard Time both dates at the Principal Address in
          Item 1.

ITEM 3.   LIMIT OF LIABILITY  (inclusive of Defense Expenses):
          $5,000,000.00 maximum aggregate Limit of Liability for the Policy
          Period.


ITEM 4.   SCHEDULE OF UNDERLYING POLICIES
          a.  Primary Policy

                Underwriter               Policy Number       Limit            Retention
                                                                 
          Federal Insurance Company        8137-71-31-A     $3,000,000    $0.00/$0.00/$1,000,000

          b.  Other Policy(ies), if any:
                Underwriter(s)            Policy Number(s)    Limit(s)         Retention(s)
                                        See attached endorsement No. 2


ITEM 5.   PREMIUM:
          $50,000.00  one year prepaid premium.
   2

ITEM 6.   NOTICE REQUIRED TO BE GIVEN TO THE UNDERWRITER SHALL BE ADDRESSED TO
          Vice President of Claims
          Executive Risk Management Associates
          P.O. Box 2002
          Simsbury, CT  06070

ITEM 7.   ENDORSEMENTS ATTACHED AT ISSUANCE
          X-301.0
          X-604.0

These Declarations, the completed signed Application and the Policy with
Endorsements shall constitute the contract between the Insureds and the 
Underwriter.

THE AETNA CASUALTY AND SURETY COMPANY By (Attorney-in-Fact)

05/02/1995
                                 INSURED'S COPY
   3
                     PRIOR AND PENDING LITIGATION EXCLUSION


     To be attached to and form part of Policy No. 095 LB 100 844 655 BCA,
issued to Bolt Beranek and Newman Inc.

     In consideration of the premium charged, the Underwriter shall not be
liable to make any payment for loss in connection with any claim made against
any of the Insureds based on, arising out of, directly or indirectly resulting
from, in consequence of, or in any way involving:

        (a)     any prior and/or pending litigation as of 12/1/93; or

        (b)     any fact, circumstance or situation underlying or alleged
                in any prior and/or pending litigation as of 12/1/93.

     All other terms, conditions and limitations of this Policy shall remain
unchanged, including, but not limited to, the maximum aggregate Limit of
Liability set forth in Item 3 of the Declarations

Complete Only When This Endorsement Is Not Prepared With The Policy OR Is Not
To Be Effective With The Policy.

Effective Date Of This Endorsement:

                                        THE AETNA CASUALTY AND SURETY COMPANY


                                        By:
                                                        Attorney-In-Fact


                                                               Endorsement No. 1
   4
                                  ENDORSEMENT


     To be attached to and form part of Policy No. 095 LB 100 844 655 BCA,
issued to Bolt Beranek and Newman Inc.


     In consideration of the premium charged, Item 4 of the Declarations is
amended to read as follows:

ITEM 4.        SCHEDULE OF UNDERLYING POLICIES

          a.    Primary Policy:

             Underwriter                   Policy Number        Limit              Retention
                                                                    
          Federal Insurance Company        8137-71-31-A       $3,000,000     $0.00/$0.00/$1,000,000

          b.    Other Policy(ies), if any:
             Underwriter                   Policy Number(s)     Limit(s)           Retention(s)
          St. Paul Mercury                    900DX0103       $5,000,000
          Insurance Company

          Federal Insurance Company          81377132-A       $2,000,000

          Old Republic Company                CUG 24032       $5,000,000

          Lloyd's of London                757/FD940716       $5,000,000


     All other terms, conditions and limitations of this Policy shall remain
unchanged, including, but not limited to, the maximum aggregate Limit of
Liability set forth in Item 3 of the Declarations

Complete Only When This Endorsement Is Not Prepared With The Policy OR Is Not
To Be Effective With The Policy.

Effective Date Of This Endorsement:

                                           THE AETNA CASUALTY AND SURETY COMPANY


                                           By:
                                                        Attorney-In-Fact


                                                               Endorsement No. 2
   5
                                  ENDORSEMENT


     To be attached to and form part of Policy No. 095 LB 100 844 655 BCA,
issued to Bolt Beranek and Newman Inc.

     In consideration of the premium charged, the premium as set forth in Item
5 of the Declarations is amended to read as follows:

ITEM 5.    Premium:

           $62,088.00 one year prepaid premium.



     All other terms, conditions and limitations of this Policy shall remain
unchanged, including, but not limited to, the maximum aggregate Limit of
Liability set forth in Item 3 of the Declarations

Complete Only When This Endorsement Is Not Prepared With The Policy OR Is Not
To Be Effective With The Policy.

Effective Date Of This Endorsement:  12/13/94

                                           THE AETNA CASUALTY AND SURETY COMPANY


                                           By:
                                                        Attorney-In-Fact


                                                               Endorsement No. 3
   6
                               POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENTS, that The Aetna Casualty and Surety Company (the
"Company") of Hartford, Connecticut does hereby appoint JOHN F. KEARNEY of
EXECUTIVE RISK MANAGEMENT ASSOCIATES its Attorney-in-Fact, with full power and
authority hereby conferred to execute, acknowledge and seal with the Company's
seal (1) any an all policies of insurance ("Policies") issued by Executive Risk
Management Associates on behalf of the Company in accordance with the terms and
provisions of the Amended and Restated Agency and Insurance Services Agreement
dated as of January 1, 1994, by and among the Company, Executive Risk Inc. and
Executive Risk Management Associates, as such agreement may be amended from
time to time; and (2) any and all binders, non- renewals, cancellations,
endorsements or notices with respect to such Policies.

IN WITNESS WHEREOF, The Aetna Casualty and Surety Company has caused this
instrument to be signed by its Vice President this 9th day of February, 1994.


                                   THE AETNA CASUALTY AND SURETY COMPANY


                                   By:
                                        Richard K. Blankenbicker, Vice President


State of Connecticut
                           ss. Hartford
County of Hartford

On this 9th day of February, 1994, before me personally appeared Richard K.
Blankenbicker, to me known, who, being by me duly sworn, did repose and say that
he is Vice President of The Aetna Casualty and Surety Company, the corporation
described in and which executed the above instrument and that he executed the
instrument on behalf and in the name of such corporation.


                           Notary Public



   7
                           CHICAGO UNDERWRITING GROUP


Ms. Joan Goldberg
Johnson & Higgins of Massachusetts, Inc.     COMPANY USE ONLY
Three Center Plaza                           ASSIGNED POLICY NUMBER: CUG24032
Boston, Massachusetts  02108                 PREVIOUS POLICY NUMBER: CUG23731
                                             POLICY PERIOD: 12/01/94 TO 12/01/95

                            REVISED INSURANCE BINDER


Chicago Underwriting Group, Inc. on behalf of the Old Republic Company
("Company") binds the insurance stipulated herein, subject to the terms,        
conditions and limitations of the policy form(s) in use by the Company.  This
binder is issued in reliance upon the application for insurance and the
submission furnished to the Company.  This binder should be delivered to the
Insured as evidence of insurance until replaced by the policy.

NAME AND ADDRESS                Bolt Beranek and Newman Inc.
OF INSURED:                     150 Cambridge Park Drive
                                Cambridge, Massachusetts  02140
                                
TYPE OF INSURANCE:              Excess Directors and Officers Liability
                                
BINDER PERIOD:                  12/01/94  TO  2/01/95
                                
POLICY FORM(S):                 ORUG-5, CHUG-67 and CHUG-71
                                
LIMIT OF LIABILITY:             $5,000,000.  Annual Aggregate
                                
EXCESS OF:                      $10,000,000.  Annual Aggregate provided by:
                                (a) $3,000,000. with Chubb
                                (b) $5,000,000. excess $3,000,000. with St. Paul
                                (c) $2,000,000. excess $8,000,000. with Chubb
                                
PREMIUM:                        $80,000.


SPECIAL CONDITIONS:

1. Subject to receipt and approval of:
   a.  Complete copy of primary policy and underlying excess policies.
   b.  Complete copy of primary binder and underlying excess binders.
2. Exclusions:
   Prior and/or Pending Litigation as of 12/01/93 (CHUG-41)
3. Extended Reporting Period:  12 months at 75% additional premium
4. Sixty (60) Day Notice of Cancellation.
   8

This binder may be cancelled by the Insured by surrender of this binder or by
written notice to the Company stating when cancellation will be effective.
This binder may be cancelled by the Company by notice to the insured in
accordance with the policy conditions.  This binder is cancelled when replaced
by policy.  If this binder is not replaced by a policy, the Company is entitled
to charge a premium for the binder according to the rules an rates in use by
the Company.

DATE:   December 6, 1994           BY:
                                        Diane C. Vasti
                                        Assistant Vice President
   9
OLD REPUBLIC COMPANIES


In consideration of an additional of $ 19,340., it is understood and agreed
coverage is amended to provide for a predetermined allocation for securities
claims in the amounts of 100% for Securities Defense Costs and 75% for other
than Securities Defense Costs (wording to follow form of Federal Insurance
Company's primary policy no.  81377131-A.





All other terms and conditions of this policy remain unchanged.


This endorsement is a part of the policy and takes effect on the effective date
of the policy,unless another effective date is shown below.


                             Complete Only When This Endorsement Is Not Prepared with the
Must Be Completed                 Policy Or Is Not to be Effective with the Policy
ENDT. No.         POLICY NO.    ISSUED TO       EFFECTIVE DATE OF THIS  ENDORSEMENT
                          
  A               CUG 24032     Bolt Beranek & Newman, Inc.             12/13/94


                                        Countersigned by
   10
OLD REPUBLIC COMPANIES


In consideration of the premium charged it is understood and agreed that the
insurance binder is amended, in part, to read:


BINDER PERIOD:    12/01/94  to  5/01/95





All other terms and conditions of this policy remain unchanged.


This endorsement is a part of the policy and takes effect on the effective date
of the policy,unless another effective date is shown below.


                             Complete Only When This Endorsement Is Not Prepared with the
  Must Be Completed               Policy Or Is Not to be Effective with the Policy
ENDT. No.         POLICY NO.    ISSUED TO       EFFECTIVE DATE OF THIS  ENDORSEMENT
                                                               
  B               CUG 24032     Bolt Beranek & Newman, Inc.             2/01/95



                                        Countersigned by
   11
OLD REPUBLIC COMPANIES


In consideration of the premium charged it is understood and agreed that the
insurance binder is amended, in part, to read:


BINDER PERIOD:    12/01/94  to  6/01/95





All other terms and conditions of this policy remain unchanged.


This endorsement is a part of the policy and takes effect on the effective date
of the policy,unless another effective date is shown below.


                             Complete Only When This Endorsement Is Not Prepared with the
  Must Be Completed               Policy Or Is Not to be Effective with the Policy
ENDT. No.         POLICY NO.    ISSUED TO       EFFECTIVE DATE OF THIS  ENDORSEMENT
                                                               
  C               CUG 24032     Bolt Beranek & Newman, Inc.             5/01/95



                                        Countersigned by

   12
                          EXECUTIVE PROTECTION POLICY

                                                                    DECLARATIONS

                                                             FIDUCIARY LIABILITY
                                                                COVERAGE SECTION

Item  1.    Parent Organization:
            BOLT BERANEK & NEWMAN INC.


Item  2.    Limits of Liability:

            (A) Each Loss               $20,000,000.
            (B) Each Policy Periods     $20,000,000.

            Note that the limits of liability and any deductible or retention
            are reduced or exhausted by DEFENSE COSTS.

Item  3.    Deductible Amounts:
            (A) Non-Indemnifiable Loss   $ None
            (B) Indemnifiable Loss       $ None

Item  4.    Sponsor Organization:
            BOLT BERANEK & NEWMAN INC.
            AND ITS SUBSIDIARIES

Item  5.    Benefit Programs included as Insureds and any other additional 
            Insureds:
            Bolt Beranek and Newman Inc Retirement Trust and any Benefit
            Program, Employee Benefit Plan or Insured Plan located anywhere in
            the world sponsored, operated, maintained or administered by the
            Sponsor Organization.

Item  6.    Extended Reporting Period:

            (A) Additional Premium:  $20,504.
            (B) Additional Period:   One Year

Item  7.    Pending or Prior Date:  DECEMBER 1, 1986

Item  8.    Continuity Date:  DECEMBER 1, 1986
   13

                          EXECUTIVE PROTECTION POLICY

Fiduciary          In consideration of payment of the premium and
Liability          subject to the Declarations, General Terms and
Coverage Section   Conditions, and the limitations, conditions,
                   provisions and other terms of this coverage
                   section, the Company agrees as follows:

Insuring Clause    1.  The Company shall pay on behalf of each of the
                       Insureds all Loss for which the Insured
                       becomes legally obligated to pay on account of
                       any Claim first made against the Insured
                       during the Policy Period or, if exercised, the
                       Extended Reporting Period, for a Wrongful Act
                       committed, attempted, or allegedly committed
                       or attempted before or during the Policy
                       Period by an Insured or by any person for
                       whose Wrongful Acts the Insured is legally
                       responsible.

Estates and Legal  2.  Subject otherwise to the General Terms and
Representatives        Conditions and the limitations, conditions,
                       provisions and other terms of this coverage
                       section, coverage shall extend to Claims for
                       the Wrongful Acts of Insured Persons made
                       against the estates, heirs, legal
                       representatives or assigns of Insured Persons
                       who are deceased or against the legal
                       representatives or assigns of Insured Persons
                       who are incompetent, insolvent or bankrupt.

Defense Provisions 3.  The Company shall have the right and duty to
                       defend any Claim covered by this coverage
                       section.  Coverage shall apply even if any of
                       the allegations are groundless, false or
                       fraudulent.  The Company's duty to defend
                       shall cease upon exhaustion of the Company's
                       applicable Limit of Liability set forth in
                       Item 2 of the Declarations for this coverage
                       section.

                       Defense Costs incurred by the Company, or by
                       the Insured with the written consent of the
                       Company, are part of and not in addition to
                       the Company's applicable Limit of Liability
                       set forth in Item 2 of the Declarations for
                       this coverage section, and the payment by the
                       Company of Defense Costs reduces such
                       applicable Limit of Liability.

                       The Insureds agree to provide the Company with
                       all information, assistance and cooperation
                       which the Company reasonably requests and
                       agree that in the event of a Claim the
                       Insureds will do nothing that may prejudice
                       the Company's position or its potential or
                       actual rights of recovery.
   14

Defense Provisions     The Insureds agree not to settle any Claim,
(Cont'd)               incur any Defense Costs or otherwise assume
                       any contractual obligation or admit any
                       liability with respect to any Claim without
                       the Company's written consent, which shall not
                       be unreasonably withheld.  The Company shall
                       not be liable for any settlement, Defense
                       Costs, assumed obligation or admission to
                       which it has not consented.

Extended Reporting 4.  If the Company terminates or refuses to renew
Period                 this coverage section other than for
                       nonpayment of premium, the Insureds shall have
                       the right, upon payment of the additional
                       premium in Item 6(A) of the Declarations for
                       this coverage section, to an extension of the
                       coverage granted by this coverage section for
                       the period in Item 6(B) of the Declarations
                       for this coverage section (Extended Reporting
                       Period) following the effective date of
                       termination or nonrenewal, but only for any
                       Wrongful Act committed, attempted, or
                       allegedly committed or attempted, prior to the
                       effective date of termination or nonrenewal.
                       This right of extension shall lapse unless
                       written notice of such election, together with
                       payment of the additional premium due, is
                       received by the Company within 30 days
                       following the effective date of termination or
                       nonrenewal.  Any Claim made during the
                       Extended Reporting Period shall be deemed to
                       have been made during the immediately
                       preceding Policy Period.

                       If the Insured terminates or declines to
                       accept renewal, the Company may, if requested,
                       at its sole option, grant an Extended
                       Reporting Period.  The offer of renewal terms
                       and conditions or premiums different from
                       those in effect prior to renewal shall not
                       constitute refusal to renew.

Exclusions         5.  The Company shall not be liable for Loss on
                       account of any Claim made against any Insured:

                       (a)  based upon, arising from, or in
                            consequence of any circumstance if
                            written notice of such circumstance has
                            been given under any policy or coverage
                            section of which this coverage section is
                            a renewal or replacement and if such
                            prior policy or coverage section affords
                            coverage (or would afford such coverage
                            except for the exhaustion of its limits
                            of liability) for such Loss, in whole or
                            in part, as a result of such notice;
   15

Exclusions             (b)  based upon, arising from, or in
(Cont'd)                    consequence of any deliberately
                            fraudulent act or omission or any willful
                            violation of any statute or regulation by
                            such Insured, if a judgment or other
                            final adjudication adverse to the Insured
                            establishes such a deliberately
                            fraudulent act or omission or willful
                            violation;

                       (c)  for libel or slander;

                       (d)  for bodily injury, mental or emotional
                            distress, sickness, disease or death of
                            any person or damage to or destruction of
                            any tangible property including loss of
                            use thereof;

                       (e)  based upon, arising from, or in
                            consequence of liability of others
                            assumed by the Insured under any contract
                            or agreement, either oral or written,
                            except to the extent that the Insured
                            would have been liable in the absence of
                            the contract or agreement or unless the
                            liability was assumed in accordance with
                            or under the agreement or declaration of
                            trust pursuant to which the Benefit
                            Program was established;

                       (f)  based upon, arising from, or in
                            consequence of the failure of the Insured
                            to comply with any law governing worker's
                            compensation, unemployment, social
                            security or disability benefits or any
                            similar law, except the Consolidated
                            Omnibus Budget Reconciliation Act of 1985
                            and amendments thereto;

                       (g)  based upon, arising from, or in
                            consequence of any demand, suit or other
                            proceeding pending, or order, decree or
                            judgment entered against any Insured, on
                            or prior to the Pending or Prior Date set
                            forth in Item 7 of the Declarations for
                            this coverage section, or the same or any
                            substantially similar fact, circumstance
                            or situation underlying or alleged
                            therein;
   16

Exclusions             (h)  based upon, arising from, or in
(Cont'd)                    consequence of (i) the actual, alleged or
                            threatened discharge, release, escape or
                            disposal of Pollutants into or on real or
                            personal property, water or the
                            atmosphere; or (ii) any direction or
                            request that the Insured test for,
                            monitor, clean up, remove, contain,
                            treat, detoxify or neutralize Pollutants,
                            or any voluntary decision to do so;
                            including but not limited to any Claim
                            for financial loss to the Sponsor
                            Organization, its security holders or
                            creditors or any Benefit Program based
                            upon, arising from, or in consequence of
                            the matters described in (i) or (ii) of
                            this exclusion.

                   6.  The Company shall not be liable for that part
                       of Loss, other than Defense Costs:
                       (a)  which constitutes fines or penalties or
                            the multiple portion of any multiplied
                            damage award, other than the five percent
                            or less, or the twenty percent or less,
                            civil penalties imposed upon an Insured
                            as a fiduciary under Section 502 (i) or
                            (1), respectively, of the Employee
                            Retirement Income Security Act of 1974,
                            as amended;

                       (b)  which is based upon, arising from, or in
                            consequence of the failure to collect
                            from employers contributions owed to a
                            Benefit Program, unless the failure is
                            because of the negligence of an Insured;

                       (c)  which constitutes the return or reversion
                            to any employer of any contribution or
                            asset of a Benefit Program; or

                       (d)  which constitutes benefits due or to
                            become due under the terms of a Benefit
                            Program unless, and to the extent that,
                            (i) the Insured is a natural person and
                            the benefits are payable by such Insured
                            as a personal obligation, and (ii)
                            recovery for the benefits is based upon a
                            covered Wrongful Act.

Severability of    7.  With respect to the Exclusions in Subsections
Exclusions             5 and 6 of this coverage section, no fact
                       pertaining to or knowledge possessed by any
                       Insured shall be imputed to any other Insured
                       to determine if coverage is available.
   17

Limit of           8.  For the purpose of this coverage section, all
Liability and          Loss arising out of the same Wrongful Act and
Deductible             all Interrelated Wrongful Acts of any Insured
                       shall be deemed one Loss, and such Loss shall
                       be deemed to have originated in the earliest
                       Policy Period in which a Claim is first made
                       against any Insured alleging any such Wrongful
                       Act or Interrelated Wrongful Acts.

                       The Company's maximum liability for each Loss
                       shall be the Limit of Liability for each Loss
                       set forth in Item 2(A) of the Declarations for
                       this coverage section.  The Company's maximum
                       aggregate liability for all Loss on account of
                       all Claims first made during the same Policy
                       Period shall be the Limit of Liability for
                       each Policy Period set forth in Item 2(B) of
                       the Declarations for this coverage section.

                       The Company's liability hereunder shall apply
                       only to that part of each Loss which is excess
                       of the Deductible Amounts set forth in Item 3
                       of the Declarations for this coverage section
                       and such Deductible Amounts shall be borne by
                       the Insureds uninsured and at their own risk.
                       The Deductible Amount for Non-Indemnifiable
                       Loss set forth in Item 3(A) of the
                       Declarations for this coverage section shall
                       apply to Loss incurred by any Insured other
                       than the Sponsor Organization or any Benefit
                       Program for which the Sponsor Organization is
                       not permitted or required to indemnify or is
                       permitted or required to indemnify but does
                       not do so by reason of Financial Impairment.
                       The Deductible Amount for Indemnifiable Loss
                       set forth in Item 3(B) of the Declarations for
                       this coverage section shall apply to all other
                       Loss.

                       If a part of a single Loss is subject to the
                       Deductible Amount for Non-Indemnifiable Loss
                       and part of the same Loss is subject to the
                       Deductible Amount for Indemnifiable Loss, the
                       maximum Deductible Amount applicable to the
                       Loss shall be the Deductible Amount for
                       Indemnifiable Loss.
   18

                       The Sponsor Organization shall be deemed
                       permitted or required to indemnify an Insured,
                       and the shareholder and board or director
                       resolutions of the Sponsor Organization shall
                       be deemed to provide indemnification to an
                       Insured, to the fullest extent authorized by
                       the Sponsor Organization's by-laws or
                       certificate of incorporation in effect at the
                       inception of this coverage section, or any
                       subsequently amended or superseding by-laws or
                       certificate of incorporation of the Sponsor
                       Organization to the extent such subsequent
                       document expands or broadens and does not
                       limit or restrict such indemnification
                       authorization.

                       Any Loss covered in whole or in part by this
                       coverage section and the Employment Practices
                       Liability coverage section of this policy (if
                       purchased) shall be subject to the limits of
                       liability, deductible and coinsurance percent
                       applicable to such other coverage section;
                       provided, however, if any limit of liability
                       applicable to such other coverage section is
                       exhausted with respect to such Loss, any
                       remaining portion of such Loss otherwise
                       covered by this coverage section shall be
                       subject to the limit of liability applicable
                       to this coverage section, as reduced by the
                       amount of such Loss otherwise covered by this
                       coverage section which is paid by the Company
                       pursuant to such other coverage section.

                       For purposes of this Subsection 8 only, the
                       Extended Reporting Period, if exercised, shall
                       be part of and not in addition to the
                       immediately preceding Policy Period.

Other Insurance    9.  If any Loss arising from any Claim made
                       against any Insured is insured under any other
                       valid policy(ies), prior or current, then this
                       coverage section shall cover such Loss,
                       subject to its limitations, conditions,
                       provisions and other terms, only to the extent
                       that the amount of such Loss is in excess of
                       the amount of payment from such other
                       insurance whether such other insurance is
                       stated to be a primary, contributory, excess,
                       contingent or otherwise, unless such other
                       insurance is written only as specific excess
                       insurance over the Limits of Liability
                       provided in this coverage section.
   19

Changes in         10. If during the Policy Period the Sponsor
Exposure               Organization creates or acquires a Subsidiary
Acquisition or         or Benefit Program or otherwise become a
Creation of            fiduciary of or responsible for the
Another Entity or      Administration of any Benefit Program
Benefit Program        ("Inception Event"), and if the Sponsor
                       Organization shall give written notice to the
                       Company of the Inception Event as soon as
                       practicable together with such information as
                       the Company may require and shall pay any
                       reasonable additional premium required by the
                       Company, coverage shall be afforded, subject
                       to the terms and conditions of this coverage
                       section, from the date of the Inception Event
                       for such Subsidiary, Benefit Program, and any
                       Insured Persons of such Benefit Program, but
                       only for Wrongful Acts committed, attempted,
                       or allegedly committed or attempted, after the
                       date of the Inception Event, unless the
                       Company agrees by endorsement to provide
                       coverage for Wrongful Acts committed,
                       attempted, or allegedly committed or
                       attempted, prior to such date.  Any such
                       coverage shall be specifically excess of the
                       amount of payment from any other insurance
                       available to such Benefit Program, Insured
                       Persons or Sponsor Organization.

                       Notwithstanding the foregoing, no coverage
                       shall be afforded pursuant to this Subsection
                       10 with respect to any employee stock
                       ownership plan or any Insured Persons or
                       Sponsor Organization thereof unless the
                       Company, by specific endorsement hereto,
                       agrees to afford such coverage.  Any such
                       coverage shall be at the terms and conditions
                       and for the premium set forth in such
                       endorsement.

Acquisition by     11. If (i) the Sponsor Organization merges into or
Another Entity         consolidates with another organization, (ii)
                       another organization or person or group of
                       organizations and/or persons acting in concert
                       acquires securities or voting rights which
                       result in ownership or voting control by the
                       other organization(s) or person(s) of more
                       than 50% of the outstanding securities
                       representing the present right to vote for
                       election of directors of the Sponsor
                       Organization, of (iii) the responsibilities of
                       the Sponsor Organization for the
                       Administration of, or as a fiduciary of, any
                       Benefit Program is fully assumed by any other
                       person and/or entity. coverage under this
                       coverage section for such Sponsor
                       Organization, Benefit Program and the Insured
                       Persons thereof who were Insureds prior to
                       such acquisition, merger, consolidation or
                       assumption of responsibilities shall continue
                       until termination of this coverage section
                       subject to the following:
   20

Changes in            (a) for the merged, consolidated or acquired
Exposure                  Sponsor Organization and any Benefit
Acquisition by            Program thereof, and for any Benefit
Another Entity            Program described in subparagraph (iii)
(Cont'd)                  above, coverage shall continue only with
                          respect to Claims for Wrongful Acts
                          committed, attempted, or allegedly
                          committed or attempted prior to such
                          merger, consolidation, acquisition, or
                          assumption of responsibilities;
                      (b) for Insured Persons of the merged,
                          consolidated, or acquired Sponsor
                          Organization or any Benefit Program
                          thereof, and for Insured Persons of any
                          Benefit Program thereof, and for Insured
                          Persons of any Benefit Plan described in
                          subparagraph (iii) above, coverage shall
                          continue with respect to Claims for
                          Wrongful Acts committed, attempted or
                          allegedly committed or attempted prior to
                          the date the Insured Person ceases to be a
                          trustee, director, officer and/or employee
                          of any Sponsor Organization not so merged,
                          consolidated or acquired.

                       The Sponsor Organization shall give written
                       notice to the Company of such merger,
                       consolidation, acquisition or assumption of
                       responsibilities as soon as practicable
                       together with such information as the Company
                       may require.  Any such continuing coverage
                       shall be specifically excess of the amount of
                       payment from any other insurance available to
                       such Sponsor Organization, Benefit Program or
                       Insured Persons.

Termination of     12. If the Sponsor Organization terminates any
Benefit Program        Benefit Program before or after the Inception
                       Date of this coverage section, coverage under
                       this coverage section with respect to such
                       terminated Benefit Program shall continue
                       until termination of this coverage section for
                       those who were Insureds at the time of such
                       Benefit Program termination, or who would have
                       been Insureds at the time of such termination
                       if this coverage section had been in effect,
                       with respect to Wrongful Acts committed,
                       attempted or allegedly committed or attempted
                       by such Insureds prior to or after the date of
                       such Benefit Program termination.  The
                       Insureds shall give written notice to the
                       Company of such Benefit Program termination as
                       soon as is practicable together with such
                       information as the Company may require.
   21

Reporting and      13. The Insureds shall, as a condition precedent
Notice                 to exercising their rights under this coverage
                       section, give to the Company written notice as
                       soon as practicable of any Claim made against
                       any of them for a Wrongful Act.

                       If during the Policy Period or Extended
                       Reporting Period (if exercised) an Insured
                       becomes aware of circumstances which could
                       give rise to a Claim and gives written notice
                       of such circumstance(s) to the Company, then
                       any Claims subsequently arising from such
                       circumstances shall be considered to have been
                       made during the Policy Period or the Extended
                       Reporting Period in which the circumstances
                       were first reported to the Company.

                       The Insureds shall, as a condition precedent
                       to exercising their rights under this coverage
                       section, give to the Company such information
                       and cooperation as it may reasonably require,
                       including but not limited to a description of
                       the Claim or circumstances, the nature of the
                       alleged Wrongful Act, the nature of the
                       alleged or potential damage, the names of
                       actual or potential claimants, and the manner
                       in which the Insured first became aware of the
                       Claim or circumstances.

Representations    14. In granting coverage to any one of the
and Severability       Insureds, the Company has relied upon the
                       declarations and statements in the written
                       application for this coverage section and upon
                       any declarations and statements in the
                       original written application submitted to
                       another insurer in respect of the prior
                       coverage inception as of the Continuity Date
                       set forth in Item 8 of the Declarations for
                       this coverage section.  All such declarations
                       and statements are the basis of such coverage
                       and shall be considered as incorporated in and
                       constituting part of this coverage section.

                       Such written application(s) for coverage shall
                       be construed as a separate application for
                       coverage by each Insured.  With respect to the
                       declarations and statements contained in such
                       written application(s) for coverage, no
                       statement in the application or knowledge
                       possessed by any Insured shall be imputed to
                       any other Insured for the purpose of
                       determining if coverage is available.

Definitions        15. When used in this coverage section:
                   
                       Administration means giving advice to
                       employees or effecting enrollment, termination
                       or cancellation of employees under a Benefit
                       Program.
   22

Definitions            Benefit Program means:
(cont'd)
                       (a)  any Sponsored Plan, or
                       (b)  any Insured Plan.
                       Claim means:
                       (a)  a civil proceeding commended by the
                            service of a complaint or similar
                            pleading,
                       (b)  a criminal proceeding commenced by a
                            return of an indictment, or
                       (c)  a formal administrative or regulatory
                            proceeding commenced by the filing of a
                            notice of charges, formal investigative
                            order or similar document,
                       against any Insured for a Wrongful Act,
                       including any appeal therefrom.

                       Defense Costs means that part of Loss
                       consisting of reasonable cost, charges, fees
                       (including but not limited to attorney's fees
                       and experts' fees) and expenses (other than
                       regular or overtime wages, salaries or fees of
                       the directors, officers or employees of the
                       Insured) incurred in defending or
                       investigating Claims and the premium for
                       appeal, attachment or similar bonds.

                       Employee Benefit Plan means any plan so
                       defined in the Employee Retirement Income
                       Security Act of 1974, as amended.

                       Financial Impairment means the status of the
                       Sponsor Organization resulting from (i) the
                       appointment by any state or federal official,
                       agency or court of any receiver, conservator,
                       liquidator, trustee, rehabilitator or similar
                       official to take control of, supervise, manage
                       or liquidate the Sponsor Organization, or (ii)
                       the Sponsor Organization becoming a debtor in
                       possession.

                       Insureds, either in the singular or plural,
                       means any one or more:
                       (a)  Sponsor Organization;
                       (b)  Benefit Program;
                       (c)  Insured Person, or
                       (d)  any other person or organization
                            designated as an additional Insured by
                            endorsement to this coverage section.
                       Insured Persons, either in the singular or
                       plural, means any one or more:

   23

Definitions            (a)  natural persons serving as a past,
(Cont'd)                    present or future trustee, director,
                            officer or employee of the Sponsor
                            Organization or of any Sponsored Plan,
                            and
                       (b)  any other natural person acting as a
                            past, present or future fiduciary of a
                            Sponsored Plan and named in Item 5 of the
                            Declarations for this coverage section.

                       Insured Plan means any government-mandated
                       insurance program for workers' compensation,
                       unemployment, social security or disability
                       benefits for employees of the Sponsor
                       Organization.

                       Interrelated Wrongful Acts means all causally
                       connected Wrongful Acts.

                       Loss means the total amount which any Insured(s)
                       becomes legally obligated to pay on account of each 
                       Claim and for all Claims in each Policy Period and 
                       the Extended Reporting Period, if exercised, made 
                       against them for Wrongful Acts for which coverage 
                       applies, including, but not limited to, damages,
                       judgements, settlements, costs and Defense
                       Costs.  Loss does not include matters
                       uninsurable under the law pursuant to which
                       this coverage section is construed.

                       Pension Benefit Plan means any plan so defined
                       in the Employee Retirement Income Security Act
                       of 1974, as amended.

                       Pollutants means any substance located
                       anywhere in the world exhibiting any hazardous
                       characteristics as defined by, or identified
                       on a list of hazardous substances issued by,
                       the United States Environmental Protection
                       Agency or a state, county, municipality or
                       locality counterpart thereof.  Such substances
                       shall include, without limitation, solids,
                       liquids, gaseous or thermal irritants,
                       contaminants or smoke, vapor, soot, fumes,
                       acids, alkalis, chemicals or waste materials.
                       Pollutants shall also mean any other air
                       emissions, odor, water, oil or oil products,
                       infectious or medical waste, asbestos or
                       asbestos products and any noise.

                       Sponsor Organization means any organization
                       designated in Item 4 of the Declarations for
                       this coverage section.

                       Sponsored Plan means:
   24

Definitions           (a) an Employee Benefit Plan which is operated
(Cont'd)                  solely by the Sponsor Organization or
                          jointly by the Sponsor Organization and a
                          labor organization for the benefit of the
                          employees of the Sponsor Organization
                          located anywhere in the world an which
                          existed at the Inception Date of this
                          coverage section or of any policy or a
                          coverage section of which this coverage
                          section is a renewal or which is created
                          or acquired after the inception of this
                          coverage section, subject to the
                          provisions outlines in this coverage
                          section;
                      (b) any other plan, fund, or program
                          specifically included as a Sponsored Plan
                          and named in Item 5 of the Declarations
                          for this coverage section; provided,
                          however, Sponsored Plan shall not include
                          any multiemployer plan, as defined in the
                          Employee Retirement Income Security Act of
                          1974, as amended; or
                      (c) any other employee benefit plan or program
                          not subject to Title 1 of the Employee
                          Retirement Income Security Act of 1974, as
                          amended, sponsored solely by the Sponsor
                          Organization for the benefit of the
                          employees of the Sponsor Organization.

                       Subsidiary, either in the singular or plural,
                       means any organization in which more than 50%
                       of the outstanding securities or voting rights
                       representing the present right to vote for
                       election of directors is owned or controlled,
                       directly or indirectly, in any combination, by
                       one or more Insured Organization.

                       Wrongful Act means:

                      (a) with respect to a Sponsored Plan,
                          (i)   any breach of the responsibilities, 
                                obligations or duties imposed upon fiduciaries
                                of the Sponsored Plan by the Employee 
                                Retirement Income Security Act of 1974, as
                                amended, or by the common or statutory law of
                                the United States, or any state or other
                                jurisdiction anywhere in the world;

                          (ii)  any other matter claimed against the Sponsor 
                                Organization or an Insured Person solely
                                because of the Sponsor Organization's or the
                                Insured Person's service as a fiduciary of any
                                Sponsored Plan; or

                          (iii) any negligent act, error or omission in the 
                                Administration of any Sponsored Plan; and

                       (b)    with respect to an Insured Plan,
   25

Definitions               (i)   any negligent act, error or omission 
(Cont'd)                        in the Administration of any Insured Plan.

   26

                          EXECUTIVE PROTECTION POLICY

                                                                     ENDORSEMENT

Coverage Section: FIDUCIARY LIABILITY   Company:  FEDERAL INSURANCE COMPANY

Effective date of                       Endorsement No.  1
this endorsement: DECEMBER 01, 1994

                                        To be attached to and form part of
                                        Policy No.   8134-46-02-B

Issued to:  BOLT BERANEK & NEWMAN INC.


It is agreed that subsection 12, Termination of Benefit Program, is amended by
deleting the following sentence:

          "The Insureds shall give written notice to the Company of such
          Benefit Program termination as soon as is practicable together
          with such information as the Company may require."

ALL OTHER TERMS AND CONDITIONS REMAIN UNCHANGED.


                                                       Authorized Representative


                                                       December 7, 1994
                                                             Date
   27

                          EXECUTIVE PROTECTION POLICY

                                                                     ENDORSEMENT

Coverage Section:  FIDUCIARY LIABILITY  Company:  FEDERAL INSURANCE COMPANY

Effective date of                       Endorsement No.  2
this endorsement:  DECEMBER 01, 1994

                                        To be attached to and form part of
                                        Policy No.   8134-46-02-B

Issued to:  BOLT BERANEK & NEWMAN INC.


It is agreed that subsection 5, Exclusions, is amended by adding the following:

            (j) based upon, arising from, or in consequence of Wrongful 
                Act(s) or Interrelated Wrongful Acts where all or any part of 
                such acts were committed, attempted, or allegedly committed 
                or attempted, prior to April 22, 1987 for Delta Graphics.

ALL OTHER TERMS AND CONDITIONS REMAIN UNCHANGED.


                                                       Authorized Representative


                                                       December 7, 1994
                                                             Date
   28

                          EXECUTIVE PROTECTION POLICY

                                                                     ENDORSEMENT

Coverage Section: FIDUCIARY LIABILITY   Company:  FEDERAL INSURANCE COMPANY

Effective date of                       Endorsement No.  3
this endorsement: DECEMBER 01, 1994

                                        To be attached to and form part of
                                        Policy No.   8134-46-02-B

Issued to:  BOLT BERANEK & NEWMAN INC.


It is understood and agreed that Subsection 15, Definitions shall be amended by
deleting the definition of Claim in its entirety and replacing it with the
following:

Claim means:

        (a)  a written demand for monetary damages,

        (b)  a civil proceeding commenced by the service of a complaint or 
             similar pleading,

        (c)  a criminal proceeding commenced by a return of an indictment, or

        (d)  a formal administrative or regulatory proceeding commenced by the 
             filing of a notice of charges, formal investigative order or 
             similar document,

against any Insured for a Wrongful Act, including any appeal therefrom.

ALL OTHER TERMS AND CONDITIONS REMAIN UNCHANGED.


                                                      Authorized Representative


                                                      December 7, 1994
                                                             Date


   29
                          EXECUTIVE PROTECTION POLICY

                                                                    DECLARATIONS

                                                         EXECUTIVE LIABILITY AND
                                                INDEMNIFICATION COVERAGE SECTION

Item  1.    Parent Organization:
            BOLT BERANEK & NEWMAN INC.


Item  2.    Limits of Liability:

            (A) Each Loss               $3,000,000.
            (B) Each Policy Periods     $3,000,000.

            Note that the limits of liability and any deductible or retention
            are reduced or exhausted by DEFENSE COSTS.
         
Item  3.    Coinsurance Percent:  NONE

Item  4.    Deductible Amount:
                  Insuring Clause 2     $1,000,000.

Item  5.    INSURED ORGANIZATION:
            BOLT BERANEK & NEWMAN INC.
            AND ITS SUBSIDIARIES

Item  6.    INSURED PERSONS:
            Any person who has been, now is, or shall become a duly elected
            director or a duly elected or appointed officer of the Insured
            Organization.

Item  7.    Extended Reporting Period:

            (A) Additional Premium: $150,000.
            (B) Additional Period:  One Year

Item  8.    Pending or Prior Date:  DECEMBER 1, 1990

Item  9.    Continuity Date:  DECEMBER 1, 1990
   30

                          EXECUTIVE PROTECTION POLICY


Executive Liability and         In consideration of payment of the premium
Indemnification Coverage        and subject to the Declarations, General
Section                         Terms and Conditions, and the limitations,
                                conditions, provisions and other terms of
                                this coverage section, the Company agrees
                                as follows:

                                Insuring Clauses

Executive          1.  The Company shall pay on behalf of each of the
Liability Coverage     Insured Persons all Loss for which the Insured
Insuring Clause 1      Person is not indemnified by the Insured
                       Organization and which the Insured Person
                       becomes legally obligated to pay on account of
                       any Claim first made against him, individually
                       or otherwise, during the Policy Period or, if
                       exercised, during the Extended Reporting
                       Period, for a Wrongful Act committed,
                       attempted, or allegedly committed or attempted
                       by such Insured Person before or during the
                       Policy Period.
Executive          2.  The Company shall pay on behalf of the Insured
Indemnification        Organization all Loss for which the Insured
Coverage Insuring      Organization and which the Insured Person as
Clause 2               permitted or required by law, which the Insured
                       Person has becomes legally obligated to pay on 
                       account of any Claim, first made against him,
                       individually or otherwise, during the Policy
                       Period or, if exercised, during the Extended
                       Reporting Period, for a Wrongful Act
                       committed, attempted, or allegedly committed
                       or attempted by such Insured Person before or
                       during the Policy Period.
Estates and Legal  3.  Subject otherwise to the General Terms and
Representatives        Conditions and limitations, conditions,
                       provisions and other terms of this coverage
                       section, coverage shall extend to Claims for
                       the Wrongful Acts of Insured Persons made
                       against the estates, heirs, legal
                       representatives or assigns of Insured Persons
                       who are deceased or against the legal
                       representatives or assigns of Insured Persons
                       who are incompetent, insolvent or bankrupt.
   31
Extended Reporting 4.  If the Company terminates or refuses to renew
Period                 this coverage section other than for
                       nonpayment of premium, the Parent Organization
                       and the Insured Persons shall have the right,
                       upon payment of the additional premium set
                       forth in Item 7(A) of the Declarations for
                       this coverage section, to an extension of the
                       coverage granted by this coverage section for
                       the period set forth in Item 7(B) of the
                       Declarations for this coverage section
                       (Extended Reporting Period) following the
                       effective date of termination or nonrenewal,
                       but only for any Wrongful Act committed,
                       attempted, or allegedly committed or
                       attempted, prior to the effective date of
                       termination or nonrenewal.  This right of
                       extension shall lapse unless written notice of
                       such election, together with payment of the
                       additional premium due, is received by the
                       Company within 30 days following the effective
                       date of termination or nonrenewal.  Any Claim
                       made during the Extended Reporting Period
                       shall be deemed to have been made during the
                       immediately preceding Policy Period.

                       If the Parent Organization terminates or
                       declines to accept renewal, the Company may,
                       if requested, at its sole option, grant an
                       Extended Reporting Period.  The offer of
                       renewal terms and conditions or premiums
                       different from those in effect prior to
                       renewal shall not constitute refusal to renew.
Exclusions         5.  The Company shall not be liable for Loss on
Applicable to          account of any Claim made against any Insured
Insuring Clauses 1     Person:
and 2
                       (a)  based upon, arising from, or in
                            consequence of any circumstance has been
                            given under any policy or coverage
                            section of which this coverage section is
                            a renewal or replacement and if such
                            prior policy or coverage section affords
                            coverage (or would afford such coverage
                            except for the exhaustion of its limits
                            of liability) for such Loss, in whole or
                            in part, as a result of such notice;

                       (b)  based upon, arising from, or in
                            consequence of any demand, suit or other
                            proceeding pending, or order, decree or
                            judgement entered against any Insured on
                            or prior to the Pending or Prior Date set
                            forth in Item 8 of the Declarations for
                            this coverage section, or the same or any
                            substantially similar fact, circumstance
                            or situation underlying or alleged
                            therein;
   32

                       (c)  brought or maintained by or on behalf of
                            any Insured except:
                                (i)   a Claim that is a derivative action 
                                      brought or maintained on behalf an
                                      Insured Organization by one or more
                                      persons who are not Insured Persons
                                      and who bring and maintain the Claim
                                      without the solicitation, assistance or
                                      participation of any Insured.
                                (ii)  a Claim brought or maintained by an 
                                      Insured Person for the actual or alleged  
                                      wrongful termination of the Insured
                                      Person or

                                (iii) a Claim brought or maintained by an 
                                      Insured Person for contribution or
                                      indemnity, if the Claim directly  results
                                      from another Claim covered under this
                                      coverage section;

                       (d)  for an actual or alleged violation of the
                            responsibilities, obligations or duties
                            imposed by the Employee Retirement Income
                            Security Act of 1974 and amendments
                            thereto or similar provisions of any
                            federal, state or local statutory law or
                            common law upon fiduciaries of any
                            pension, profit sharing, health and
                            welfare or other employee benefit plan or
                            trust established or maintained for the
                            purpose of providing benefits to
                            employees of an Insured Organization;

                       (e)  for bodily injury, mental or emotional
                            distress, sickness, disease or death of
                            any person or damage to or destruction of
                            any tangible property including loss of
                            use thereof; or

                       (f)  based upon, arising from, or in
                            consequence of (i) the actual, alleged or
                            threatened discharge, release, escape or
                            disposal of Pollutants into or on real or
                            personal property, water or the
                            atmosphere; or (ii) any direction or
                            request that the insured test for,
                            monitor, clean up, remove, contain,
                            treat, detoxify or neutralize Pollutants,
                            or any voluntary decision to do so;
                            including but not limited to any Claim
                            for financial loss to the Insured
                            Organization, its security holders or its
                            creditors based upon, arising from, or in
                            consequence of the matters described in
                            (i) or (ii) of this exclusion.
Exclusions
(cont'd)
Exclusions         6.  The Company shall not be liable under Insuring
Applicable to          Clause 1 for Loss on account of any Claim made
Insuring Clause 1      against any Insured Person:
Only
   33
                       (a)  for an accounting of profits made from
                            the purchase or sale by such Insured
                            Person of securities of the Insured
                            Organization within the meaning of
                            Section 16 (b) of the Securities Exchange
                            Act of 1934 and amendments thereto or
                            similar provisions of any federal, state
                            or local statutory law or common law;

                       (b)  based upon, arising from, or in
                            consequence of any deliberately
                            fraudulent act or omission or any willful
                            violation of any statute or regulation by
                            such Insured Person, if a judgement or
                            other final adjudication adverse to the
                            Insured Person establishes such a
                            deliberately fraudulent act or omission
                            or willful violation; or

                       (c)  based upon, arising from, or in
                            consequence of such Insured Person having
                            gained in fact any personal profit,
                            remuneration or advantage to which such
                            Insured Person was not legally entitled.

Severability of    7.  With respect to the Exclusions in Subsections
Exclusions             5 and 6 of this coverage section, no fact
                       pertaining to or knowledge possessed by any
                       Insured Person shall be imputed to any other
                       Insured Person to determine if coverage is
                       available.

Limit of           8.  For the purpose of this coverage section, all
Liability,             Loss arising out of the same Wrongful Act and
Deductible and         all Interrelated Wrongful Acts of any Insured
Coinsurance            Person shall be deemed one Loss, and such Loss
                       shall be deemed to have originated in the
                       earliest Policy Period in which a Claim is
                       first made against any Insured Person alleging
                       any such Wrongful Act or Interrelated Wrongful
                       Acts.

                       The Company's maximum liability for each Loss,
                       whether covered under Insuring Clause 1 or
                       Insuring Clause 2 or both, shall be the Limit
                       of Liability for each Loss set forth in Item
                       2(A) of the Declarations for this coverage
                       section.  The Company's maximum aggregate
                       liability for all Loss on account of all
                       Claims first made during the same Policy
                       Period, whether covered under Insuring Clause
                       1 or Insuring Clause 2 or both, shall be the
                       Limit of Liability for each Policy Period set
                       forth in Item 2(B) of the Declarations for
                       this coverage section.
   34

Limit of               The Company's liability under Insuring Clause
Liability,             2 shall apply only to that part of each Loss
Deductible and         which is excess of the Deductible Amount set
Coinsurance            forth in Item 4 of the Declarations for this
(continued)            coverage section and such Deductible Amount
                       shall be borne by the Insureds uninsured and
                       at their own risk.

                       If a single Loss is covered in part under
                       Insuring Clause 1 and in part under Insuring
                       Clause 2, the Deductible Amount applicable to
                       the Loss shall be the Insuring Clause 2
                       deductible set forth in Item 4 of the
                       Declarations for this coverage section.

                       With respect to all Loss (excess of the
                       applicable Deductible Amount) originating in
                       any one Policy Period, the Insureds shall bear
                       uninsured and at their own risk that percent
                       of all such Loss specified as the Coinsurance
                       Percent in Item 3 of the Declarations for this
                       coverage section, and the Company's liability
                       hereunder shall apply only to the remaining
                       percent of all such Loss.

                       Any Loss covered in whole or in part by this
                       coverage section and the Employment Practices
                       Liability coverage section of this policy (if
                       purchased) shall be subject to the limits of
                       liability, deductible and coinsurance percent
                       applicable to such other coverage section;
                       provided, however, if any limit of liability
                       applicable to such other coverage section is
                       exhausted with respect to such Loss, any
                       remaining portion of such Loss otherwise
                       covered by this coverage section shall be
                       subject to the Limits of Liability and
                       Coinsurance Percent applicable to this
                       coverage section, as reduced by the amount of
                       such Loss otherwise covered by this coverage
                       section which is paid by the Company pursuant
                       to such other coverage section.

                       For purposes of this Subsection 8 only, the
                       Extended Reporting Period, if exercised, shall
                       be part of and not in addition to the
                       immediately preceding Policy Period.

Presumptive        9.  If the Insured Organization:
Indemnification
                       (a)  fails or refuses, other than for reason
                            of Financial Impairment, to indemnify the
                            Insured Person for Loss; and
                       (b)  is permitted or required to indemnify the
                            Insured Person for such Loss pursuant to:

   35
Presumptive                 (i)  the by-laws or certificate of incorporation 
Indemnification                  of the Insured Organization in effect at
(continued)                      the inception of this coverage
                                 section, or
                            (ii) any subsequently amended or superseding 
                                 by-laws or certificate of incorporation of the
                                 Insured Organization provided, however, that
                                 such amended or superseding by-laws or
                                 certificate of incorporation expand or
                                 broaden, and do not restrict or in any
                                 way limit, the Insured Organization's ability
                                 to indemnify the Insured Person;
                       then, notwithstanding any other conditions,
                       provisions or terms of this coverage section
                       to the contrary, any payment by the Company of
                       such Loss shall be subject to (i) the Insuring
                       Clause 2 Deductible Amount set forth in Item 4
                       of the Declarations for this coverage section,
                       and (ii) all of the Exclusions set forth in
                       Subsections 5 and 6 of this coverage section.

                       For purposes of this Subsection 9, the
                       shareholder and board of director resolutions
                       of the Insured Organization shall be deemed to
                       provide indemnification for such Loss to the
                       fullest extent permitted by such by-laws or
                       certificate of incorporation.

Reporting and      10. The Insureds shall, as a condition precedent
Notice                 to exercising their rights under this coverage
                       section, give to the Company written notice as
                       soon as practicable of any Claim made against
                       any of them for a Wrongful Act.

                       If during the Policy Period or Extended
                       Reporting Period (if exercised) an Insured
                       becomes aware of circumstances which could
                       give rise to a Claim and gives written notice
                       of such circumstance(s) to the Company, then
                       any Claims subsequently arising from such
                       circumstances shall be considered to have been
                       made during the Policy Period or the Extended
                       Reporting Period in which the circumstances
                       were first reported to the Company.

   36

                       The Insureds shall, as a condition precedent
                       to exercising their rights under this coverage
                       section, give to the Company such information
                       and cooperation as it may reasonably require,
                       including but not limited to a description of
                       the Claim or circumstances, the nature of the
                       alleged Wrongful Act, the nature of the
                       alleged or potential damage, the names of
                       actual or potential claimants, and the manner
                       in which the Insured first became aware of the
                       Claim or circumstances.

Defense and        11. Subject to this Subsection, it shall be the
Settlement             duty of the Insured Persons and not the duty
                       of the Company to defend Claims made against
                       the Insured Persons.

                       The Insureds agree not to settle any Claim,
                       incur any Defense Costs or otherwise assume
                       any contractual obligation or admit any
                       liability with respect to any Claim without
                       the Company's written consent, which shall not
                       be unreasonably withheld.  The Company shall
                       not be liable for any settlement.  Defense
                       Costs, assumed obligation or admission to
                       which it has not consented.

                       The Company shall have the right and shall be
                       given the opportunity to effectively associate
                       with the Insureds in the investigation,
                       defense and settlement, including but not
                       limited to the negotiation of a settlement, of
                       any Claim that appears reasonably likely to be
                       covered in whole or in part by this coverage
                       section.

                       The Insureds agree to provide the Company with
                       all information, assistance and cooperation
                       which the Company reasonably requests and
                       agree that in the event of a Claim the
                       Insureds will do nothing that may prejudice
                       the Company's position or its potential or
                       actual rights of recovery.

                       Defense Costs are part of and not in addition
                       to the Limits set forth in Item 2 of the
                       Declarations for this coverage section, and
                       the payment by the Company of Defense Costs
                       reduces such Limits of Liability.
   37

Allocation         12. If both Loss covered by this coverage section
                       an loss not covered by this coverage section
                       are incurred, either because a Claim against
                       the Insured Persons includes both covered and
                       uncovered matters or because a Claim is made
                       against both an Insured Person and others,
                       including the Insured Organization, the
                       Insureds and the Company shall use their best
                       efforts to agree upon a fair and proper
                       allocation of such amount between covered Loss
                       and uncovered loss.

                       If the Insureds and the Company agree on an
                       allocation of Defense Costs, the Company shall
                       advance on a current basis Defense Costs
                       allocated to the covered Loss.  If the
                       Insureds and the Company cannot agree on an
                       allocation.

                       (a)  no presumption as to allocation shall
                            exist in any arbitration, suit or other
                            proceeding;
                       (b)  the Company shall advance on a current
                            basis Defense Costs which the Company
                            believes to be covered under this
                            coverage section until a different
                            allocation is negotiated, arbitrated or
                            judicially determined; and
                       (c)  the Company, if requested by the
                            Insureds, shall submit the dispute to
                            binding arbitration.  The rules of the
                            American Arbitration Association shall
                            apply except with respect to the
                            selection of the arbitration panel, which
                            shall consist of one arbitrator selected
                            by the Insureds, one arbitrator selected
                            by the Company, and a third independent
                            arbitrator selected by the first two
                            arbitrators.

                       Any negotiated, arbitrated or judicially
                       determined allocation of Defense Costs on
                       account of a Claim shall be applied
                       retroactively to all Defense Costs on account
                       of such claim, notwithstanding any prior
                       advancement to the contrary.  Any allocation
                       or advancement of Defense Costs on account of
                       a Claim shall not apply to or create any
                       presumption with respect to the allocation of
                       other Loss on account of such Claim.
   38

Other Insurance    13. If any Loss arising from any Claim made
                       against any Insured Persons is insured under
                       any other valid policy(ies), prior or current,
                       then this coverage section shall cover such
                       Loss, subject to its limitations, conditions,
                       provisions and other terms, only to the extent
                       that the amount of such Loss is in excess of
                       the amount of payment from such other
                       insurance whether such other insurance is
                       stated to be a primary, contributory, excess,
                       contingent or otherwise, unless such other
                       insurance is written only as specific excess
                       insurance over the Limits of Liability
                       provided in this coverage section.

Changes in         14. If the Insured Organization (i) acquires
Exposure               securities or voting rights in another
Acquisition or         organization or creates another organization,
Creation of            which as a result of such acquisition or
Another                creation becomes a Subsidiary, or (ii)
Organization           acquires any organization by merger into or
                       consolidation with an Insured Organization,
                       such organization and its Insured Persons
                       shall be Insureds under this coverage section
                       but only with respect to Wrongful Acts
                       committed, attempted, or allegedly committed
                       or attempted, after such acquisition or
                       creation unless the Company agrees, after
                       presentation of a complete application and all
                       appropriate information, to provide coverage
                       by endorsement for Wrongful Acts committed,
                       attempted, or allegedly committed or
                       attempted, by such Insured Persons prior to
                       such acquisition or creation.

                       If the fair value of all cash, securities,
                       assumed indebtedness and other consideration
                       paid by the Insured Organization for any such
                       acquisition or creation exceeds 10% of the
                       total assets of the Parent Organization as
                       reflected in the Parent Organization's most
                       recent audited consolidated financial
                       statements, the Parent Organization shall give
                       written notice of such acquisition or creation
                       to the Company as soon as practicable together
                       with such information as the Company may
                       require and shall pay any reasonable
                       additional premium required by the Company.
   39

Acquisition of     15. If (i) the Parent Organization merges into or
Parent                 consolidates with another organization, or
Organization by        (ii) another organization or person or group
Another                or organizations and/or persons acting in
Organization           concert acquires securities or voting rights
                       which result in ownership or voting control by
                       the other organization(s) or person(s) of more
                       than 50% of the outstanding securities
                       representing the present right to vote for the
                       election of directors of the Parent
                       Organization, coverage under this coverage
                       section shall continue until termination of
                       this coverage section, but only with respect
                       to Claims for Wrongful Acts committed,
                       attempted, or allegedly committed or attempted
                       by Insured Persons prior to such merger,
                       consolidation or acquisition.  The Parent
                       Organization shall give written notice of such
                       merger, consolidation or acquisition to the
                       Company as soon as practicable together with
                       such information as the Company may require.

Cessation of       16. In the event an organization ceases to be a
Subsidiaries           Subsidiary before or after the Inception Date
                       of this coverage section, coverage with
                       respect to such Subsidiary and its Insured
                       Persons shall continue until termination of
                       this coverage section but only with respect to
                       Claims for Wrongful Acts committed, attempted
                       or allegedly committed or attempted prior to
                       the date such organization ceased to be a
                       Subsidiary.

Representations    17. In granting coverage to any one of the
and Severability       Insureds, the Company has relied upon the
                       declarations and statements in the written
                       application for this coverage section and upon
                       any declarations and statements in the
                       original written application submitted to
                       another insurer in respect of the prior
                       coverage inception as of the Continuity Date
                       set forth in item 9 of the Declarations for
                       this coverage section.  All such declarations
                       and statements are the basis of such coverage
                       and shall be considered as incorporated in and
                       constituting part of this coverage section.

                       Such written application(s) for coverage shall
                       be construed as a separate application for
                       coverage by each of the Insured Persons.  With
                       respect to the declarations and statements
                       contained in such written application(s) for
                       coverage, no statement in the application or
                       knowledge possessed by any Insured Person
                       shall be imputed to any other Insured Person
                       for the purpose of determining if coverage is
                       available.
   40

Definitions        18. When used in this coverage section:
                       Claim means:

Definitions            (i)    a written demand for monetary damages,
(cont'd)
                       (ii)   a civil proceeding commenced by the
                              service of a complaint or similar
                              pleading,
                       (iii)  a criminal proceeding commenced by a
                              return of an indictment, or
                       (iv)   a formal administrative or regulatory
                              proceeding commenced by the filing of a
                              notice of charges, formal investigative
                              order or similar document,

                       against any Insured Person for a Wrongful Act,
                              including any appeal therefrom.

                       Defense Costs means that part of Loss
                       consisting of reasonable costs, charges, fees
                       (including but not limited to attorney's fees
                       and experts' fees) and expenses (other than
                       regular or overtime wages, salaries or fees of
                       the directors, officers or employees of the
                       Insured Organization) incurred in defending or
                       investigating Claims and the premium for
                       appeal, attachment or similar bonds.

                       Financial Impairment means the status of the
                       Insured Organization resulting from (i) the
                       appointment by any state or federal official,
                       agency or court of any receiver, conservator,
                       liquidator, trustee, rehabilitator or similar
                       official to take control of, supervise, manage
                       or liquidate the Insured Organization, or
                       (ii) the Insured Organization becoming debtor
                       in possession.

                       Insured, either in the singular or plural,
                       means the Insured Organization and any Insured
                       Person.

                       Insured Capacity means the position or
                       capacity designated in Item 6 of the
                       Declarations for this coverage section held by
                       any Insured Person but shall not include any
                       position or capacity in any organization other
                       than the Insured Organization, even if the
                       Insured Organization directed or requested the
                       Insured Person to serve in such other position
                       or capacity.

                       Insured Organization means, collectively,
                       those organizations designated in Item 5 of
                       the Declarations for this coverage section.
   41

                       Insured Person, either in the singular or
                       plural, means anyone or more of those persons
                       designated in Item 6 of the Declarations for
                       this coverage section.

Definitions            Interrelated Wrongful Acts means all causally
(cont'd)               connected Wrongful Acts.

                       Loss means the total amount which any Insured
                       Person becomes legally obligated to pay on
                       account of each Claim and for all Claims in
                       each Policy Period and the Extended Reporting
                       Period, if exercised, made against them for
                       Wrongful Acts for which coverage applies,
                       including, but not limited to, damages,
                       judgements, settlements, costs and Defense
                       Costs.  Loss does not include (i) any amount
                       not indemnified by the Insured Organization
                       for which the Insured Person is absolved
                       from payment by reason of any covenant
                       agreement or court order, (ii) any amount
                       incurred by the Insured Organization
                       (including its board of directors or any
                       committee of the board of directors) in
                       connection with the investigation or
                       evaluation of any Claim or potential Claim by
                       or on behalf of the Insured Organization,
                       (iii) fines or penalties imposed by law or the
                       multiple portion of any multiplied damage
                       award, or (iv) matters uninsurable under the
                       law pursuant to which this coverage section is
                       construed.

                       Pollutants means any substance located
                       anywhere in the world exhibiting any hazardous
                       characteristics as defined by, or identified
                       on a list of hazardous substances issued by,
                       the United States Environmental Protection
                       Agency or a state, county, municipality or
                       locality counterpart thereof.  Such substances
                       shall include, without limitation, solids,
                       liquids, gaseous or thermal irritants,
                       contaminants or smoke, vapor, soot, fumes,
                       acids, alkalis, chemicals or waste materials.
                       Pollutants shall also mean any other air
                       emission, odor, waste water, oil or oil
                       products, infectious or medical waste,
                       asbestos or asbestos products and any noise.

                       Subsidiary, either in the singular or plural,
                       means any organization in which more than 50%
                       of the outstanding securities or voting rights
                       representing the present right to vote for
                       election of directors is owned or controlled,
                       directly or indirectly, in any combination, by
                       one or more Insured Organizations.
   42

                       Wrongful Act means any error, misstatement,
                       misleading statement, act, omission, neglect,
                       or breach of duty committed, attempted, or
                       allegedly committed or attempted, by an
                       Insured Person, individually or otherwise, in
                       his Insured Capacity, or any matter claimed
                       against him solely by reason of his serving in
                       such Insured Capacity.
   43
                          EXECUTIVE PROTECTION POLICY

                                                                     ENDORSEMENT

Coverage Section:  EXECUTIVE LIABILITY  Company:  FEDERAL INSURANCE COMPANY

Effective date of                       Endorsement No.  1
this endorsement:  DECEMBER 01, 1994

                                        To be attached to and form part of
                                        Policy No.   8137-71-31-A

Issued to:  BOLT BERANEK & NEWMAN INC.


It is agreed that subsection 5, Exclusions:  Exclusions Applicable to Insuring
Clauses 1 and 2, is amended by deleting paragraph (b) in its entirety and
replacing it with the following:

            (b) based upon, arising from, or in consequence of any demand, 
                suit or other proceeding pending, or order, decree or judgement
                entered against any insured on or prior to the Pending or Prior
                Date set forth in Item 8 of the Declarations for this coverage
                section, or the same or substantially the same facts underlying
                or alleged therein:

ALL OTHER TERMS AND CONDITIONS REMAIN UNCHANGED.


                                                       Authorized Representative


                                                       December 8, 1994
                                                              Date
   44

                          EXECUTIVE PROTECTION POLICY

                                                                     ENDORSEMENT

Coverage Section: EXECUTIVE LIABILITY   Company:  FEDERAL INSURANCE COMPANY

Effective date of                       Endorsement No.  2
this endorsement: DECEMBER 01, 1994

                                        To be attached to and form part of
                                        Policy No.   8137-71-31-A

Issued to:  BOLT BERANEK & NEWMAN INC.


It is agreed that subsection 6, "Exclusions:  Exclusions Applicable to Insuring
Clause 1 Only", is amended by adding the following:

            (d) of any Subsidiary for any alleged Wrongful Act occurring at 
                any time when the Insured Organization did not own more than
                50% of the issued and outstanding voting stock of such
                subsidiary either directly or indirectly through one or more of
                its subsidiaries.

ALL OTHER TERMS AND CONDITIONS REMAIN UNCHANGED.


                                                       Authorized Representative


                                                       December 8, 1994
                                                             Date
   45

                          EXECUTIVE PROTECTION POLICY

                                                                     ENDORSEMENT

Coverage Section: EXECUTIVE LIABILITY   Company:  FEDERAL INSURANCE COMPANY

Effective date of                       Endorsement No.  3
this endorsement: DECEMBER 01, 1994

                                        To be attached to and form part of
                                        Policy No.   8137-71-31-A

Issued to:  BOLT BERANEK & NEWMAN INC.


It is understood and agreed that under Exclusion 6, found on Page 4 and 10,
paragraph (d) is amended by deleting it in its entirety and replacing it with
the following:

            (d) under Insuring Clause 1 of BBN Delta Graphics and Network 
                Switching Systems, for any alleged Wrongful Act occurring at
                any time when the Insured Organization did not own more than
                50% of the issued and outstanding voting stock of such
                Subsidiary either directly or indirectly through one or more of
                its Subsidiaries; however, this exclusion shall not apply to    
                Claims alleging Wrongful Acts occurring prior to when the
                corporation became a Subsidiary if the Insured was a Director
                or Officer of the Subsidiary for at least a ninety day period
                during the time when the corporation was a Subsidiary.

ALL OTHER TERMS AND CONDITIONS REMAIN UNCHANGED.


                                                       Authorized Representative


                                                       December 8, 1994
                                                            Date
   46

                          EXECUTIVE PROTECTION POLICY

                                                                     ENDORSEMENT

Coverage Section:  EXECUTIVE LIABILITY  Company:  FEDERAL INSURANCE COMPANY  

Effective date of                       Endorsement No.  4
this endorsement:  DECEMBER 01, 1994

                                        To be attached to and form part of
                                        Policy No.   8137-71-31-A

Issued to:  BOLT BERANEK & NEWMAN INC.


It is agreed that Item 6 of the Declarations, Insured Persons, is amended to
include the following:

          Any person who was, is, or shall become a duly elected
          director or a duly elected or appointed officer, including
          divisional directors and officers performing their duties in
          the following divisions:

                    Communications Division
                    Software Products Division
                    Systems & Technologies Division
                    International Division
                    Corporate Services Division

ALL OTHER TERMS AND CONDITIONS REMAIN UNCHANGED.


                                                       Authorized Representative


                                                       December 8, 1994
                                                             Date
   47

                          EXECUTIVE PROTECTION POLICY

                                                                     ENDORSEMENT

Coverage Section: EXECUTIVE LIABILITY   Company:  FEDERAL INSURANCE COMPANY

Effective date of                       Endorsement No.  5
this endorsement: DECEMBER 01, 1994

                                        To be attached to and form part of
                                        Policy No.   8137-71-31-A

Issued to:  BOLT BERANEK & NEWMAN INC.


It is understood and agreed that both Insuring Clause I., Executive Liability
Coverage, and Insuring Clause II., Executive Indemnification Coverage, are
amended by adding the following:

          In the event of a Claim, should a Loss be payable under Policy
          Number  440-43-26 issued by the National Union Fire Insurance
          Company of Pittsburgh, PA., the Company's obligation to pay
          will be for amounts immediately in excess of Loss payable
          under such other policy and this policy will not contribute
          with such other insurance.

It is also understood and agreed that if the National Union Fire Insurance
Company of Pittsburgh, PA. wrongfully refuses to pay under its policy, the
Company will respond as if this policy was primary insurance; provided that the
Company is subrogated to all rights or recovery under such policy.  The Insured
shall execute all papers reasonably required and take all reasonable actions
that may be necessary to secure the rights of the Company,

ALL OTHER TERMS AND CONDITIONS REMAIN UNCHANGED.


                                                       Authorized Representative


                                                       December 8, 1994
                                                             Date
   48
                          EXECUTIVE PROTECTION POLICY

                                                                     ENDORSEMENT

Coverage Section:  EXECUTIVE LIABILITY  Company:  FEDERAL INSURANCE COMPANY 

Effective date of                       Endorsement No.  6
this endorsement:  DECEMBER 01, 1994

                                        To be attached to and form part of
                                        Policy No.   8137-71-31-A

Issued to:  BOLT BERANEK & NEWMAN INC.


1.   It is agreed that subsection 5, Exclusions:  Exclusions Applicable to
Insuring Clauses 1 and 2, is amended by deleting paragraph (b) in its entirety
and replacing it with the following:

            (b) based upon, arising from, or in consequence of any demand, 
                suit or other proceeding pending, or order, decree or judgment
                entered against any Insured on or prior to the Pending or Prior
                Date set forth in Item 8 of the Declarations for this coverage  
                section, or the same or substantially the same facts underlying
                or alleged therein;

2.   It is further agreed that subsection 8, Limits of Liability, Deductible
and Coinsurance, is amended by deleting the fourth paragraph in its entirety
and replacing it with the following:

          If a single Loss is covered in part under Insuring Clause 1 and in
          part under Insuring Clause 2, the maximum Deductible Amount
          applicable to the Loss shall be the Insuring Clause 2 deductible set
          forth in Item 4 of the Declarations for this coverage section.

ALL OTHER TERMS AND CONDITIONS REMAIN UNCHANGED.


                                                       Authorized Representative


                                                       December 8, 1994
                                                            Date
   49

                          EXECUTIVE PROTECTION POLICY

                                                                     ENDORSEMENT

Coverage Section: EXECUTIVE LIABILITY   Company:  FEDERAL INSURANCE COMPANY 

Effective date of                       Endorsement No.  7
this endorsement: DECEMBER 01, 1994

                                        To be attached to and form part of
                                        Policy No.   8137-71-31-A

Issued to:  BOLT BERANEK & NEWMAN INC.


        PREDETERMINED ALLOCATION FOR SECURITIES CLAIMS

In consideration of the premium paid, it is agreed as follows:

1.   With respect to any Securities Loss for which Insuring Clause 2 applies,
     subsection 12, Allocation, is deleted in its entirety and replaced by the
     following:

     12.  If both Securities Loss covered and not covered by this coverage 
          section are incurred, either because a Securities Claim against
          Insured Persons includes both covered and uncovered matters or
          because a Securities Claim is made against both an Insured Person and
          the Insured Organization, the Insureds and the Company shall allocate
          such amount to Loss as follows:

          a)   100% allocation of Securities Defense Costs, which shall be 
               advanced on a current basis by the Company; and
          b)   75% allocation of Securities Loss other than Securities Defense
               Costs.

          These agreed allocations shall be final and binding on the Insureds
          and the Company.

2.   The following is added to subsection 18, Definitions:

          Securities Claim means (i) a written demand for monetary damages,
          (ii) a civil proceeding commenced by the service of a complaint or
          similar pleading, (iii) a criminal proceeding commenced by a return
          of an indictment, or (iv) a formal administrative or regulatory
          proceeding commenced by the filing of a notice of charges, formal
          investigative order or similar document, which, in whole or in part,
          is based upon, arises from or is in consequence of the purchase or
          sale of, or offer to purchase or sell, any securities issued by the
          Insured Organization.

          Securities Loss means the total amount which any Insured Person,
          solely or jointly with the Insured Organization, becomes legally
          obligated to pay on account of a Securities Claim, including, but
          not limited to, damages, judgments, settlements, costs and
          Securities Defense Costs.  Securities Loss 

   50
          
          does not include (i) any amount not indemnified by the Insured
          Organization for which an Insured is absolved from payment by reason
          of any convenant, agreement or court order, (ii) any amount incurred
          by an Insured Organization (including its board of directors or any
          committee of the board of directors) in connection with the
          investigation or evaluation of any Securities Claim or potential
          Securities Claim by or on behalf of the Insured Organization, (iii)
          fines or penalties imposed by law or the multiple portion of any
          multiplied damage award, or (iv) matters uninsurable under the law
          pursuant to which this coverage section is construed.

          Securities Defense Costs means that part of Securities Loss
          consisting of reasonable costs, charges, fees (including but not
          limited to attorneys' fees and experts' fees) and expenses (other
          than regular or overtime wages, salaries or fees of the directors,
          officers or employees of the Insured Organization) incurred in
          defending or investigating Securities Claims and the premium for
          appeal, attachment or similar bonds.


ALL OTHER TERMS AND CONDITIONS REMAIN UNCHANGED.


                                                       Authorized Representative



                                                                Date


   51
CHUBB GROUP OF INSURANCE COMPANIES


                                   DECLARATIONS
                                   DIRECTORS AND OFFICERS LIABILITY AND
                                   REIMBURSEMENT EXCESS POLICY

                                   




Item  1.  Parent Organization:          Policy Number  81377132-A
          BOLT BERANEK & NEWMAN INC.
          AND ITS SUBSIDIARIES

Item  2.  Principal Address:         FEDERAL INSURANCE COMPANY
          150 CAMBRIDGE PARK DRIVE   Incorporated under the laws of New Jersey a
          CAMBRIDGE, MA  02140       stock insurance company, herein called the
                                     Company

Item  3.  Limit of Liability:
          Each Policy Year           $2,000,000

Item  4.  Underlying Policy(ies):
          (A) Primary Policy:        Federal Insurance Company
                                     Policy #8137-71-31
                                     December 1, 1994 to December 1, 1995
          (B) Other Policy(ies):     St. Paul Mercury Insurance Company
                                     Policy  #900DX0049
                                     December 1, 1994 to December 1, 1995

Item  5.  Policy Period:             From  December 01, 1994
                                     To    December 01, 1995

Item  6.  Endorsement(s) Effective at Inception:  Nos. 1 and 2

Item  7.  Termination of Prior Policies:  8137-71-32



IN WITNESS WHEREOF, the Company issuing this policy has caused this policy to
be signed by its authorized officers, but it shall not be valid unless also
signed by a duly authorized representative of the Company.

                          FEDERAL INSURANCE COMPANY

                                        bas-12/08/94.02
   52
        DIRECTORS AND OFFICERS LIABILITY AND REIMBURSEMENT EXCESS POLICY

     In consideration of payment of required premium and subject to the
Declarations made a part hereof and the limitations, conditions, provisions and
other terms of this policy, the Company agrees with the Insureds as follows:

                                INSURING CLAUSE

     The Company shall provide the Insureds with insurance during the Policy
Period excess of the Underlying Insurance.  Coverage hereunder shall attach
only after all such Underlying Insurance has been exhausted and shall then
apply in conformance with the terms, conditions and endorsements of the Primary
Policy except as specifically set forth in the terms, and conditions and
endorsements of this policy.

                      MAINTENANCE OF UNDERLYING INSURANCE

     All of the Underlying Policy(ies) scheduled in Item 4 of the Declarations
shall be maintained during the Policy Period in full effect and affording
coverage at least as broad as the Primary Policy, except for any reduction of
the aggregate limit(s) of liability available under the Underlying Insurance
solely be reason of payment of losses thereunder.  Failure to comply with the
foregoing shall not invalidate this policy but the Company shall not be liable
to a greater extent than if this condition had been compiled with.

     In the event of any actual or alleged (a) failure by the Insureds to give
notice or to exercise any extensions under any Underlying Insurance or (b)
misrepresentation or breach of warranties by any of the Insureds with respect
to any Underlying Insurance, the  Company shall not be liable hereunder to a
greater extent than it would have been in the absence of such actual or alleged
failure, misrepresentation or breach.

                        DEPLETION OF UNDERLYING LIMIT(S)

     In the event of the depletion of the limit(s) of liability of the
Underlying Insurance solely as the result of payment of losses thereunder, this
policy shall, subject to the Company's limit of liability and to the other
terms of the policy, continue to apply for subsequent losses as excess
insurance over the amount of insurance remaining under such Underlying
Insurance.  In the event of the exhaustion of all of the limit(s) of liability
of such Underlying Insurance solely as a result of payment of losses
thereunder, the remaining limits available under this policy shall, subject to
the Company's limit of liability and to the other terms of this policy,
continue for subsequent losses as primary insurance and any retention specified
in the Primary Policy shall be imposed under this policy; otherwise no
retention shall be imposed under this policy.

                               LIMIT OF LIABILITY

     The amount set forth in Item 3 of the Declarations is the limit of
liability of the Company and shall be the maximum of the Company in each Policy
Year.
   53

                              CLAIM PARTICIPATION

     The Company may, at its sole discretion, elect to participate in the
investigation, settlement or defense of any claim against any of the Insureds
for matters covered by this policy even if the Underlying Insurance has not
been exhausted.

                            SUBROGATION - RECOVERIES

     In the event of any payment under this policy, the Company shall be
subrogated to all the Insureds' rights of recovery against any person or
organization, as stated in the Primary Policy , and the Insureds shall execute
and deliver instruments and papers and do whatever else is necessary to secure
such rights.

     Any amounts recovered after payment of loss hereunder shall be appointed
in the inverse order of payment to the extent of actual payment.  The expenses
of all such recovery proceedings shall be apportioned in the ratio of
respective recoveries.

                                     NOTICE

     The Company shall be given notice in writing as soon as is practicable (a)
in the event of the cancellation of any Underlying Insurance and (b) of any
notice given or additional or return premiums charged or paid in connection
with any Underlying Insurance.

     Notice of any claim shall be given in writing to the Company at 51 John F.
Kennedy Parkway, Short Hills, New Jersey  07078.

                          COMPANY AUTHORIZATION CLAUSE

     By acceptance of this policy, the Parent Corporation named in Item 1 of
the Declarations agrees to act on behalf of all the Insureds with respect to
the giving and receiving of notice of claim or cancellations, the payment of
premiums and the receiving of any return premiums that may become due under
this policy; and the Insureds agree that the Parent Corporation shall act on
their behalf.

                                   ALTERATION

     No change in or modification of this policy shall be effective except when
made by written endorsement signed by an authorized employee of Chubb & Son,
Inc.

                               POLICY TERMINATION

     This policy may be cancelled by the Parent Corporation at any time by
written notice or by surrender of this policy to the Company.  This policy may
also be cancelled by or on behalf of the Company by delivery to the Parent
Corporation or by mailing to the Parent Corporation, by registered, certified
or other first class mail, at the address shown in Item 2 of the Declarations,
written notice stating when, not less than thirty days thereafter, the
cancellation shall become effective.  The mailing of such notice as aforesaid
shall be 

   54
sufficient proof of notice and this policy shall terminate at the date and hour
specified in such notice.

     If the period of limitation relating to the giving of notice is prohibited
or made void by any law controlling the construction thereof, such period shall
be deemed to be amended so as to be equal to the minimum period of limitation
permitted by such law.

     The Company shall refund the unearned premium computed at customary short
rates if the policy is terminated in its entirety by the Parent Corporation.
Under any other circumstances the refund shall be computed pro rata.

                         TERMINATION OF PRIMARY POLICY

     This policy shall terminate immediately upon the termination of the
Primary Policy, whether by the Insureds or the primary insurer.  Notice of
cancellation or non-renewal of the Primary Policy duly given by the primary
insurer shall serve as notice of the cancellation or non-renewal of this policy
by the Company.

                        TERMINATION OF PRIOR POLICY(IES)

     The taking effect of this policy shall terminate, if not already
terminated, the policy(ies) specified in Item 7 of the Declarations.

                               POLICY DEFINITIONS

Insureds means those persons or organizations Insured under the Primary Policy.

Primary Policy means the policy scheduled in Item 4 (A) of the Declarations or
any policy of the same insurer replacing or renewing such policy.

Policy Year means the one year period between the anniversaries of the Primary
Policy, provided that:  (1) the first Policy Year of this policy shall be the
period between the inception of this policy and the next subsequent anniversary
of the Primary Policy, and (2) the last Policy Year of this policy shall be the
period between the termination of this policy and the anniversary of the
Primary Policy immediately preceding such termination.  If any discovery period
extension is exercised such extension shall be treated as set forth in the
Primary Policy.

Underlying Insurance means all those policies scheduled in Item 4 of the
Declarations and any policies replacing them.
   55
CHUBB GROUP OF INSURANCE COMPANIES

                                                                     ENDORSEMENT

                                        Company:   Federal Insurance Company
Effective date of
this endorsement:   December 1, 1994    Endorsement No.   1

                                        To be attached to and form part of
                                        Policy No.  81377132-A

Issued to:  Bolt Beranek and Newman Inc.


It is hereby understood and agreed that the following is deleted in its
entirety:

                               Policy Termination

          This policy may be cancelled by the Parent Corporation at any time by
     written notice or by surrender of this policy to the Company.  This policy
     may also be cancelled by or on behalf of the Company by delivery to the
     Parent Corporation or by mailing to the Parent Corporation, by registered,
     certified or other first class mail, at the address shown in Item 2 of the
     Declarations, written notice stating when, not less than thirty days
     thereafter, the cancellation shall become effective.  The mailing if such
     notice as aforesaid shall be sufficient proof of notice and this policy
     shall terminate at the date and hour specified in such notice.

          If the period of limitation relating to the giving of notice is
     prohibited or made void by any law controlling the construction thereof,
     such period shall be deemed to be amended so as to be equal to the minimum
     period of limitation permitted by such law.  The Company shall refund the
     unearned premium computed at customary short rates if the policy is
     terminated in its entirety by the Parent Corporation.  Under any other
     circumstances the refund shall be computed pro rata.



     bas-12/08/94.03
   56

CHUBB GROUP OF INSURANCE COMPANIES

                                                                     ENDORSEMENT

                                        Company:   Federal Insurance Company
Effective date of
this endorsement:   December 1, 1994    Endorsement No.   1 - Continued

                                        To be attached to and form part of
                                        Policy No.  81377132-A

Issued to:  Bolt Beranek and Newman Inc.


and substituted in lieu thereof:

                               Policy Termination

          This policy may be cancelled by the Parent Corporation at any time by
     written notice or by surrender of this policy to the Company.  This policy
     may also be cancelled by or on behalf of the Company by delivery to the
     Parent Corporation or by mailing to the Parent Corporation, by registered,
     certified or other first class mail, at the address shown in Item 2 of the
     Declarations, written notice stating when, not less than thirty days
     thereafter, the cancellation shall become effective.  The mailing if such
     notice as aforesaid shall be sufficient proof of notice and this policy
     shall terminate at the date and hour specified in such notice.

          If the period of limitation relating to the giving of notice is
     prohibited or made void by any law controlling the construction thereof,
     such period shall be deemed to be amended so as to be equal to the minimum
     period of limitation permitted by such law.  The Company shall refund the
     unearned premium computed at customary short rates if the policy is
     terminated in its entirety by the Parent Corporation.  Under any other
     circumstances the refund shall be computed pro rata.



     ALL OTHER TERMS AN CONDITIONS REMAIN UNCHANGED


                                   AUTHORIZED REPRESENTATIVE

                                        bas-12/08/94.04

                                             DATE
   57

CHUBB GROUP OF INSURANCE COMPANIES

                                                                     ENDORSEMENT

                                        Company:   Federal Insurance Company
Effective date of
this endorsement:   December 1, 1994    Endorsement No.   2

                                        To be attached to and form part of
                                        Policy No.  81377132-A

Issued to:  Bolt Beranek and Newman Inc.


It is agreed that:

In addition to the exclusions included and made a part of the "Primary Policy",
the following exclusion shall apply to this policy:

(-)       1.    Arising from any litigation, claims, demands, causes of action,
                legal or quasi-legal proceedings, decrees or judgements
                against any "Insured(s)", occurring prior to, or pending as of
                December 1, 1990, of which any "Insured(s)" had received notice
                or otherwise had knowledge as of such date;

          2.    Arising from any subsequent litigation, claims, demands, causes
                of action, legal or quasi-legal proceedings, decrees or
                judgments against any "Insured(s)" arising from, or based on
                substantially the same matters as alleged in the pleadings of
                such prior or pending litigation claims, demands, causes of
                action, legal or quasi-legal proceedings, decrees or judgments
                against any "Insured(s)"; or

          3.    Arising from any act of any "Insured(s)" which gave rise to 
                such prior or pending litigation, claims, demands, causes of 
                action, legal or quasi-legal proceedings, decrees or judgments 
                against any "Insured(s)."





ALL OTHER TERMS AN CONDITIONS REMAIN UNCHANGED


                                   AUTHORIZED REPRESENTATIVE

                                        bas-12/08/94.05

                                            DATE

   58
                          EXECUTIVE PROTECTION POLICY


                                        DECLARATIONS

                                        EXECUTIVE PROTECTION POLICY

                                        Policy Number  8137-71-31-A

                                        Federal Insurance Company, a stock
                                        insurance company, incorporated under
                                        the laws of Indiana, herein called the
                                        Company

Item  1.  Parent Organization:
          BOLT BERANEK & NEWMAN INC.

          150 CAMBRIDGE PARK DRIVE
          CAMBRIDGE, MASSACHUSETTS
          02140

Item  2.  Policy Period:             From  12:01 A.M. on  December 01, 1994
                                     To    12:01 A.M.     December 01, 1995
                                     Local time at the address shown in Item  1.

Item  3.  Coverage Summary
          Description
          GENERAL TERMS AND CONDITIONS
          EXECUTIVE LIABILITY AND INDEMNIFICATION
          OUTSIDE DIRECTORSHIP LIABILITY

Item  4.  Termination of
          Prior Policies:  8137-71-31


THE EXECUTIVE LIABILITY AND INDEMNIFICATION, FIDUCIARY LIABILITY, OUTSIDE
DIRECTORSHIP LIABILITY AND EMPLOYMENT PRACTICES LIABILITY COVERAGE SECTIONS
(WHICHEVER ARE APPLICABLE) ARE ALL WRITTEN ON A CLAIMS MADE BASIS.  EXCEPT AS
OTHERWISE PROVIDED, THESE COVERAGE SECTIONS COVER ONLY CLAIMS FIRST MADE        
AGAINST THE INSURED DURING THE POLICY PERIOD.  PLEASE READ CAREFULLY.


In witness whereof, the Company issuing this policy has caused this policy to
be signed by its authorized officers, but it shall not be valid unless
also signed by a duly authorized representative of the Company.

                           FEDERAL INSURANCE COMPANY
   59

                          EXECUTIVE PROTECTION POLICY


Effective date of
this endorsement:  DECEMBER 01, 1994

                                             Company:  FEDERAL INSURANCE COMPANY

To be attached to and from part of
Policy No.  8137-71-31-A


Issued to:  BOLT BERANEK & NEWMAN INC.




The following is a schedule of endorsements issued with the policy at inception:


GENERAL TERMS AND CONDITIONS


     ENDORSEMENT NUMBER                      FORM NUMBER
                                          
            1                                14-02-0961

EXECUTIVE LIABILITY AND INDEMNIFICATION

     ENDORSEMENT NUMBER                      FORM NUMBER
            1                                14-02-0961
            2                                14-02-0961
            3                                14-02-0961
            4                                14-02-0961
            5                                14-02-0961
            6                                14-02-0961

OUTSIDE DIRECTORSHIP LIABILITY

     ENDORSEMENT NUMBER                      FORM NUMBER
            1                                14-02-0961
            2                                14-02-0961

   60

                       CHUBB GROUP OF INSURANCE COMPANIES

                                                                    PREMIUM BILL


Insured:    BOLT BERANEK & NEWMAN            Date:  DECEMBER 6, 1994

Producer:   JOHNSON & HIGGINS OF MASS INC

Company:    FEDERAL INSURANCE COMPANY

THIS BILLING IS TO BE ATTACHED TO AND FORM A PART OF THE POLICY REFERENCED
BELOW.

NOTE:  PLEASE RETURN THIS BILL WITH REMITTANCE AND NOTE HEREON ANY CHANGES.
BILL WILL BE RECEIPTED AND RETURNED TO YOU PROMPTLY UPON REQUEST.

PLEASE REMIT TO PRODUCER INDICATED ABOVE.  PLEASE REFER TO EXECUTIVE
PROTECTION DEPT



               POLICY OR
EFFECTIVE     CERTIFICATE            COVERAGE                   PREMIUM
  DATE          NUMBER
                                                    
12/01/94      8137-71-31-A    Executive Liability and           $ 200,000.
      to                      Indemnification Coverage
12/01/95


                                                         TOTAL  $ 200,000.



          WHEN REMITTING PLEASE INDICATE POLICY OR CERTIFICATE NUMBER
   61

                       CHUBB GROUP OF INSURANCE COMPANIES

                                                                    PREMIUM BILL


Insured:    BOLT BERANEK & NEWMAN            Date:  DECEMBER 6, 1994

Producer:   JOHNSON & HIGGINS OF MASS INC

Company:    FEDERAL INSURANCE COMPANY

THIS BILLING IS TO BE ATTACHED TO AND FORM A PART OF THE POLICY REFERENCED
BELOW.

NOTE:  PLEASE RETURN THIS BILL WITH REMITTANCE AND NOTE HEREON ANY CHANGES.
BILL WILL BE RECEIPTED AND RETURNED TO YOU PROMPTLY UPON REQUEST.

PLEASE REMIT TO PRODUCER INDICATED ABOVE.  PLEASE REFER TO EXECUTIVE
PROTECTION DEPT



                POLICY OR
EFFECTIVE      CERTIFICATE        COVERAGE                    PREMIUM
  DATE           NUMBER
                                                    
12/01/94       8137-71-31-A   Additional Premium For            $ 48,350.
      to                      Predetermined Allocation
12/01/95


                                                         TOTAL  $ 48,350.



          WHEN REMITTING PLEASE INDICATE POLICY OR CERTIFICATE NUMBER
   62

                          EXECUTIVE PROTECTION POLICY


                                        DECLARATIONS

                                        EXECUTIVE PROTECTION POLICY

                                        Policy Number  8134-46-02-B

                                        Federal Insurance Company, a stock
                                        insurance company, incorporated under
                                        the laws of Indiana, herein called the
                                        Company

Item  1.  Parent Organization:
          BOLT BERANEK & NEWMAN INC.

          150 CAMBRIDGE PARK DRIVE
          CAMBRIDGE, MASSACHUSETTS
          02140

Item  2.  Policy Period:             From  12:01 A.M. on  December 01, 1994
                                     To    12:01 A.M.     December 01, 1995
                                     Local time at the address shown in Item  1.

Item  3.  Coverage Summary
          Description
          GENERAL TERMS AND CONDITIONS
          FIDUCIARY LIABILITY
          CRIME INSURANCE

Item  4.  Termination of
          Prior Policies:  8134-46-02-A


THE EXECUTIVE LIABILITY AND INDEMNIFICATION, FIDUCIARY LIABILITY, OUTSIDE
DIRECTORSHIP LIABILITY AND EMPLOYMENT PRACTICES LIABILITY COVERAGE SECTIONS
(WHICHEVER ARE APPLICABLE) ARE ALL WRITTEN ON A CLAIMS MADE BASIS.  EXCEPT AS   
OTHERWISE PROVIDED, THESE COVERAGE SECTIONS COVER ONLY CLAIMS FIRST MADE
AGAINST THE INSURED DURING THE POLICY PERIOD.  PLEASE READ CAREFULLY.


In witness whereof, the Company issuing this policy has caused this policy to
be signed by its authorized officers, but it shall not be valid unless
also signed by a duly authorized representative of the Company.

                           FEDERAL INSURANCE COMPANY



- ------------------------------------       ------------------------------------
             Secretary                                  President


         December 13, 1994
- ------------------------------------       ------------------------------------
               Date                              Authorized Representative

   63

                          EXECUTIVE PROTECTION POLICY


Effective date of
this endorsement:  DECEMBER 01, 1994

                                             Company:  FEDERAL INSURANCE COMPANY

To be attached to and from part of
Policy No.  8134-46-02-B


Issued to:  BOLT BERANEK & NEWMAN INC.




The following is a schedule of endorsements issued with the policy at inception:


FIDUCIARY LIABILITY


     ENDORSEMENT NUMBER                      FORM NUMBER
                                          
            1                                14-02-0961
            2                                14-02-0961
            3                                14-02-1423

CRIME INSURANCE

     ENDORSEMENT NUMBER                      FORM NUMBER
            1                                14-02-0961
            2                                14-02-0961
            3                                14-02-0961
            4                                14-02-0961
            5                                14-02-1498
            6                                14-02-0976
            7                                14-02-0983
            8                                14-02-0998

   64

                       CHUBB GROUP OF INSURANCE COMPANIES

                                                                    PREMIUM BILL


Insured:    BOLT BERANEK & NEWMAN            Date:  DECEMBER 7, 1994

Producer:   JOHNSON & HIGGINS OF MASS INC
            THREE CENTER PLAZA
            BOSTON, MA  02108

Company:    FEDERAL INSURANCE COMPANY

THIS BILLING IS TO BE ATTACHED TO AND FORM A PART OF THE POLICY REFERENCED
BELOW.

Policy Number:  8134-46-02-B

Policy Period:  December 01, 1994               to    December 01, 1995

NOTE:  PLEASE RETURN THIS BILL WITH REMITTANCE AND NOTE HEREON ANY CHANGES.
BILL WILL BE RECEIPTED AND RETURNED TO YOU PROMPTLY UPON REQUEST.

PLEASE REMIT TO PRODUCER INDICATED ABOVE.




COVERAGE                                     PREMIUM
                                       
Fiduciary Liability Coverage                 $ 27,338.
Crime Insurance Coverage                     $ 29,980.


                                   TOTAL     $ 57,318.





          WHEN REMITTING PLEASE INDICATE POLICY OR CERTIFICATE NUMBER


   65
CHUBB

                          EXECUTIVE PROTECTION POLICY


GENERAL TERMS
AND CONDITIONS

Territory                1.  Coverage shall extend anywhere in the world.

Terms and Conditions     2.  Except for the General Terms and Conditions or
                             unless stated to the contrary in any coverage
                             section, the terms and conditions of each
                             coverage section of this policy apply only
                             to that section and shall  not be construed to
                             apply to any other coverage section of this
                             policy.

Limits of Liability and  3.  Unless stated to the contrary in any coverage
Deductible Amounts           section, the limits of liability and deductible 
                             amounts shown for each coverage section of this
                             policy are separate limits of liability and
                             separate deductible amounts pertaining to the
                             coverage section for which they are shown; the     
                             application of a deductible amount to a loss under
                             one coverage section of this policy shall not
                             reduce the deductible amount under any other
                             coverage section of this policy.

Notice                   4.  Notice to the Company under this policy shall be
                             given in writing addressed to:

                             Notice of Claim:

                                             National Claims Department
                                             Chubb Group of Insurance Companies
                                             15 Mountain View Road
                                             Warren, New Jersey 07059

                             All Other Notices:

                                             Executive Protection Department
                                             Chubb Group of Insurance Companies
                                             15 Mountain View Road
                                             Warren, New Jersey 07059

                             Such notice shall be effective on the date of 
                             receipt by the Company at such address.

Investigation            5.  The Company may make any investigation
and Settlement               it deems necessary and may, with the written 
                             consent of the Insured, make any settlement of a
                             claim it deems expedient.  If the Insured
                             withholds consent to such  settlement, the
                             Company's liability for all loss on account of
                             such 
   66

                             claim shall not exceed the amount for which the
                             Company could have settled such claim plus costs,
                             charges and expenses accrued as of the date such
                             settlement was proposed in writing by the Company
                             to the Insured.


Valuation and            6.  All premiums, limits, retentions, loss and other 
Foreign Currency             amounts under this policy are expressed and 
                             payable in the currency of the United States of
                             America.  Except as otherwise provided in any
                             coverage section, if judgment is rendered,
                             settlement is denominated or another element of
                             loss under this policy is stated in a currency
                             other than United States of America dollars,       
                             payment under this policy shall be made in United
                             States dollars at the rate of exchange published
                             in the WALL STREET JOURNAL on the date the final
                             judgment is reached, the amount of the settlement
                             is agreed upon or the other element of loss is
                             due, respectively.

Subrogation              7.  In the event of any payment under this policy, the 
                             Company shall be subrogated to the extent of such
                             payment to all the Insured' rights of recovery,
                             and the Insured shall execute all papers required
                             and shall do everything necessary to secure and
                             preserve such rights, including the execution of
                             such documents necessary to enable the Company
                             effectively to bring suit in the name of the
                             Insured.

Action Against           8.  No action shall lie against the Company unless, 
the Company                  as a condition precedent thereto, there shall have
                             been full compliance with all the terms of this
                             policy.  No person or organization shall have any
                             right under this policy to join the Company as a
                             party to any action against the Insured to
                             determine the Insured's liability nor shall the
                             Company be impleaded by the Insured or his legal
                             representatives.  Bankruptcy or insolvency of an
                             Insured or of the estate of an Insured shall not
                             relieve the Company of its obligations nor deprive
                             the Company of its rights under this policy.

Authorization Clause     9.  By acceptance of this policy, the Parent
                             Organization agrees to act on behalf of all
                             Insureds with respect to the giving and receiving
                             of notice of claim or termination, the payment of
                             premiums and the receiving of any return premiums
                             that may become due under this policy, the
                             negotiation, agreement to and acceptance of
                             endorsements, and the giving or receiving of any
                             notice provided for in this policy (except the
                             giving of notice to apply for the Extended
                             Reporting Period), and the Insureds agree that
                             the Parent Organization shall act on their behalf.

Alteration               10. No change in, modification of , or assignment of 
and Assignment               interest under this policy shall be effective 
                             except when made by a written endorsement to this
                             policy which is signed by an authorized
                             employee of Chubb & Son Inc. 
   67

Termination of           11. This policy or any coverage section shall 
Policy or                    terminate at the earliest of the following times:
Coverage Section
                             (A)  sixty days after the receipt by the Parent 
                                  Organization of a written notice of 
                                  termination from the Company,

                             (B)  upon the receipt by the Company of written 
                                  notice of termination from the Parent
                                  Organization,

                             (C)  upon expiration of the Policy Period as set 
                                  forth in Item 2 of the Declarations of this
                                  policy, or

                             (D)  at such other time as may be agreed upon by 
                                  the Company and the Parent Organization.

                             The Company shall refund the unearned premium
                             computed at customary short rates if the policy or
                             any coverage section is terminated by the
                             Parent Organization.  Under any other
                             circumstances the refund shall be computed pro
                             rata.

Termination of           12. Any bonds or policies issued by the Company or its
Prior Bonds                  affiliates and specified in Item 4 of the 
of Policies                  Declarations of this policy shall terminate, if 
                             not already terminated, as of the inception date
                             of this policy.  Such prior bonds or policies
                             shall not cover any loss under the Crime or
                             Kidnap/Ransom & Extortion coverage sections not
                             discovered and notified to the Company prior to
                             the inception date of this policy.

Definitions              13. When used in this policy:
                             Parent Organization means the organization
                             designated in Item 1 of the Declarations of this
                             policy.

                             Policy Period means the period of time specified
                             in Item 2 of the Declarations of this policy,
                             subject to prior termination in accordance with
                             Subsection 11 above.  If this period is less than
                             or greater than one year, then the Limits of
                             Liability specified in the Declarations for each
                             coverage section shall be the Company's maximum
                             limit of liability under such coverage section for
                             the entire period. 

   68


                                  ENDORSEMENT


Coverage Section:  GENERAL TERMS        Company:  FEDERAL INSURANCE COMPANY

Effective date of                       Endorsement No.:  1
this endorsement:  DECEMBER 01, 1994

                                        To be attached to and form part of
                                        Policy No. 8137-71-31-A


Issued to:   BOLT BERANEK AND NEWMAN INC.

It is agreed that subsection 5, Investigation and Settlement, is deleted in its
entirety and replaced with the following:

     5.   The Company may make any investigation it deems necessary and may,
          with the written consent of the Insured, make any settlement of a
          claim it deems expedient.  With respect to any coverage section other
          than the Executive Liability and Indemnification and Outside
          Directorship Liability coverage sections, if the Insured withholds
          consent to such settlement, the Company's liability for all loss on
          account of such claim shall not exceed the amount for which the
          Company could have settled such claim plus costs, charges and expense
          accrued as of the date such settlement was proposed in writing by the
          Company to the Insured.

ALL OTHER TERMS AND CONDITIONS REMAIN UNCHANGED.

Authorized Representative

Date:



   69
CHUBB

                          EXECUTIVE PROTECTION POLICY

                                               DECLARATIONS

                                               OUTSIDE DIRECTORSHIP LIABILITY
                                               COVERAGE SECTION

Item 1.        Parent Organization:
               BOLT BERANEK AND NEWMAN INC.

Item 2.        Limits of Liability:

               (A)  Each Loss                $3,000,000.
               (B)  Each Policy Period       $3,000,000.

               Note that the limits of liability and any deductible or retention
               are reduced or exhausted by Defense Costs.

Item 3.        Coinsurance Percent:  NONE

Item 4.        Deductible Amount:

                    Insuring Clause 2        $1,000,000

Item 5.        Insured Organization:
               BOLT BERANEK AND NEWMAN INC.
               AND ITS SUBSIDIARIES

Item 6.        Insured Persons:
               With regard to a Non-Profit Outside Entity, any person who has
               been, now is or shall become a duly elected director, a duly
               elected or appointed officer, or an employee of the Insured
               Organization.  With regard to any Scheduled Outside Entity, any
               individual listed on a Scheduled Outside Entity Endorsement.

Item 7.        Extended Reporting Period:

               (A)  Additional Premium:      75% OF THE ANNUAL PREMIUM
               (B)  Additional Period:       ONE YEAR

Item 8.        Pending or Prior Date:  DECEMBER 1, 1990

Item 9.        Continuity Date:  DECEMBER 1, 1990

OUTSIDE DIRECTORSHIP     In consideration of payment of the premium and subject
LIABILITY COVERAGE       to the Declarations, General Terms and Conditions, and
                         the limitations,
   70

SECTION                  conditions, provisions and other terms of this
                         coverage section, the Company agrees as follows:

INSURING CLAUSES

Outside Directorship     1.  The Company shall pay on behalf of each of the 
Liability Coverage           Insured Persons who serve in an Outside 
Insuring Clause 1            Directorship all Loss for which the Insured Person 
                             is not indemnified by the Insured Organization or
                             the Outside Entity and which the Insured Person
                             becomes legally obligated to pay on account of any
                             Claim first made against him, individually or
                             otherwise, during the Policy Period or, if
                             exercised, during the Extended Reporting Period,
                             for a Wrongful Act committed, attempted, or
                             allegedly committed or attempted by such Insured
                             Person before or during the Policy Period.

Outside Directorship     2.  The Company shall pay on behalf of the Insured 
Indemnification Coverage     Organization all Loss (i) for which the Insured
Insuring Clause 2            Organization grants indemnification, as permitted
                             or required by law, to each Insured Person who
                             serves in an Outside Directorship, (ii) for which
                             the Insured Person is not indemnified by the
                             Outside Entity, and (iii) which the Insured Person
                             has become legally obligated to pay on account of
                             any Claim first made against him, individually or
                             otherwise, during the Policy Period or, if
                             exercised, during  the Extended Reporting Period
                             for a Wrongful Act committed, attempted, or
                             allegedly committed or attempted by such Insured
                             Person before or during the Policy Period.

ESTATES AND LEGAL        3.  Subject otherwise to the General Terms and
REPRESENTATIVES              Conditions and the limitations, conditions, 
                             provisions and other terms of this coverage
                             section, coverage shall extend to Claims for the
                             Wrongful Acts of Insured Persons made against the
                             estates, heirs, legal representatives or
                             assigns of Insured Persons who are deceased or
                             against the legal representatives or assigns of
                             Insured Persons who are incompetent, insolvent or
                             bankrupt.

EXTENDED                 4.  If the Company terminates or refuses to renew this 
REPORTING PERIOD              coverage section other than for nonpayment of 
                             premium, the Parent Organization and the Insured
                             Persons shall have the right, upon payment of the
                             additional premium set forth in Item 7(A) of the   
                             Declarations for this coverage section, to an
                             extension of the coverage granted by this coverage
                             section for the period set forth in Item 7(B) of
                             the Declarations for this coverage section
                             (Extended Reporting Period) following the
                             effective date of termination or non renewal, but
                             only for any Wrongful Act committed, attempted, or
                             allegedly committed 

   71

                             or attempted, prior to the effective date of
                             termination or nonrenewal.  This right of
                             extension shall lapse unless written notice of
                             such election, together with payment of    the
                             additional premium due, is received by the Company
                             within 30 days following the effective date of
                             termination or nonrenewal.  Any Claim made during
                             the Extended Reporting Period shall be deemed to
                             have been made during the immediately preceding
                             Policy Period.

                             If the Parent Organization terminates or declines
                             to accept renewal, the Company may, if requested,
                             at its sole option, grant an Extended Reporting
                             Period.  The offer of renewal terms and    
                             conditions or premiums different from those in
                             effect prior to renewal shall not constitute
                             refusal to renew.

EXCLUSIONS

Exclusions               5.  The Company shall not be liable for Loss on
Applicable to                account of any Claim made against any Insured 
Insuring Clauses 1 and 2     Person:

                             (a)  based upon, arising from, or in
                                  consequence of any circumstance if written
                                  notice of such circumstance has been given
                                  under any policy or coverage section of which
                                  this coverage section is a renewal or
                                  replacement and if such prior policy or
                                  coverage section affords coverage (or would
                                  afford such coverage except for the
                                  exhaustion of its limits of liability) for
                                  such Loss, in whole or in part, as a result
                                  of such notice.

                             (b)  based upon, arising from, or in
                                  consequence of any demand, suit or other
                                  proceeding pending, or order, decree or
                                  judgment entered against any Insured Person
                                  on or prior to:

                                  (i)  the Pending or Prior Dated set
                                       forth in Item 8 of the Declarations for
                                       this coverage section with respect to
                                       Outside Directorships in a Non-Profit
                                       Outside Entity;

                                  (ii) the Pending or Prior Date set forth
                                       in the Scheduled Outside Entity
                                       Endorsement hereto with respect to
                                       Outside Directorships in a Scheduled
                                       Outside Entity,

                                  or the same or any substantially similar fact,
                                  circumstance or situation underlying or 
                                  alleged therein; 
   72

                             (c)  brought or maintained by or on behalf of
                                  any Insured, the Outside Entity, or one or
                                  more of the Outside entity's directors,
                                  officers, trustees, governors or equivalent
                                  executives, except:

                                  (i)  a Claim that is a derivative action
                                       brought and maintained on behalf of an
                                       Insured Organization by one or more
                                       persons who are not Insured Persons  and
                                       who bring and maintain the Claim without
                                       the solicitation, assistance or
                                       participation of any Insured; or

                                  (ii) a Claim that is a derivative action
                                       brought and maintained on behalf of the
                                       Outside Entity by one or more persons
                                       who are not directors, officers,
                                       trustees, governors or equivalent
                                       executives of the Outside Entity and who
                                       bring and maintain the Claim without the
                                       solicitation, assistance or
                                       participation or the Outside Entity or
                                       any director, officer, trustee, governor
                                       or equivalent executive thereof;

                             (d)  for an actual or alleged violation of
                                  the responsibilities, obligations or duties
                                  imposed by the Employee Retirement Income
                                  Security Act of 1974 and amendments thereto
                                  or similar provisions of any federal, state
                                  or local statutory law or common law upon
                                  fiduciaries of any pension, profit sharing,
                                  health and welfare or other employee benefit
                                  plan or trust established or maintained for
                                  the purpose or providing benefits to
                                  employees of any Outside Entity;

                             (e)  for bodily injury, mental or emotional
                                  distress, sickness, disease or death of any
                                  person or damage to or destruction of any
                                  tangible property including loss of use
                                  thereof;

                             (f)  based upon, arising from, or in
                                  consequence of (i) the actual, alleged or
                                  threatened discharge, release, escape or
                                  disposal of Pollutants into or on real or
                                  personal property, water or the atmosphere;
                                  or (ii) any direction or request that the
                                  Insured or Outside Entity test for, monitor,
                                  clean up, remove, contain, treat, detoxify or
                                  neutralize Pollutants, or any voluntary
                                  decision to do so; including but not limited
                                  to any Claim for financial loss to the
                                  Insured Organization, the Outside Entity, or
                                  any security holders or creditors thereof
                                  based upon, 
                                  
   73
                                  arising from, or in consequence
                                  of the matters described in (i) or (ii) of
                                  this Exclusion; or

                             (g)  for Wrongful Acts committed, attempted
                                  or allegedly committed or attempted after the
                                  date such Insured Person ceases to serve in
                                  the Outside Directorship.

Exclusions               6.  The Company shall not be liable under Insuring 
Applicable to                Clause 1 for Loss on account of any Claim made 
Insuring Clause 1 Only       against any Insured Person:

                             (a)  for an accounting of profits made from
                                  the purchase or sale by such Insured Person
                                  of securities of the Insured Organization or
                                  the Outside Entity within the meaning of
                                  Section 16(b) of the Securities Exchange Act
                                  of 1934 and amendments thereto or similar
                                  provisions of any federal, state or local
                                  statutory law or common law;

                             (b)  based upon, arising from, or in
                                  consequence of any deliberately fraudulent
                                  act or omission or any willful violation of
                                  any statute or regulation by such Insured
                                  Person, if a judgment or other final
                                  adjudication adverse to the Insured Person
                                  establishes such a deliberately fraudulent
                                  act or omission or willful violation; or

                             (c)  based upon, arising from, or in
                                  consequence of such Insured Person having
                                  gained in fact any personal profit,
                                  remuneration or advantage to which such
                                  Insured Person was not legally entitled.

Severability             7.  With respect to the Exclusions in Subsections 5 
of Exclusions                and 6 of this coverage section, no fact 
                             pertaining to or knowledge possessed by any
                             Insured Person shall be imputed to any other
                             Insured Person to determine if coverage is
                             available.

LIMIT OF LIABILITY,      8.  For the purposes of this coverage section, all 
DEDUCTIBLE AND               Loss arising out of the same Wrongful Act and all 
COINSURANCE                  Interrelated Wrongful Acts of any Insured Person 
                             shall be deemed one Loss, and such Loss shall be
                             deemed to have originated in the earliest Policy
                             Period in which a Claim is first made against
                             any Insured Person alleging any such Wrongful Acts
                             or Interrelated Wrongful Acts. 

                             The Company's maximum liability for each
                             Loss, whether covered under Insuring Clause 1 or
                             Insuring Clause 2 or both, shall be the Limit of
                             Liability for Each Loss set forth in Item 
   74

                             2(A) of the Declarations for this coverage
                             section.  The Company's maximum aggregate
                             liability for all Loss on account of all Claims
                             first made during the same Policy Period, whether
                             covered under Insuring Clause 1 or Insuring
                             Clause 2 or both, shall be the Limit of Liability
                             for each Policy Period set forth in Item 2(B) of
                             the Declarations for this coverage section.

                             The Company's liability under Insuring Clause 2 
                             shall apply only to that part of each Loss which
                             is excess of the Deductible Amount set forth in
                             Item 4 of the Declarations for this coverage
                             section and such Deductible Amount shall be borne
                             by the Insureds uninsured and at their own risk.

                             If a single Loss is covered in part under
                             Insuring Clause 1 and in part under Insuring
                             Clause 2, the Deductible Amount applicable to such
                             Loss shall be the Insuring Clause 2 deductible set
                             forth in Item 4 of the Declarations for this
                             coverage section.

                             With respect to all Loss (excess of the
                             applicable Deductible Amount) originating in any
                             one Policy Period, the Insureds shall bear
                             uninsured and at their own risk that percent of
                             all such Loss specified as the Coinsurance Percent
                             in Item 3 of the Declarations for this coverage
                             section and the Company's liability hereunder
                             shall apply only to the remaining percent of all
                             such Loss.

                             For purposes of this Subsection 8 only, the
                             Extended Reporting Period, if exercised, shall be
                             part of and not in addition to the immediately
                             preceding Policy Period.

                             If the Company or any of its subsidiaries or
                             affiliated companies makes payment under another
                             policy or another coverage section of this policy
                             on account of any Claim also covered under this
                             coverage section, the Limit of Liability for this
                             coverage section with respect to such Claim shall
                             be reduced by the amount of such payment.

Presumptive              9.  If the Insured Organization
Indemnification
                             (a)  fails or refuses, other than for reason of 
                                  Financial Impairment, to indemnify the
                                  Insured Person for Loss; and
   75

                             (b)  is permitted or required to indemnify
                                  the Insured Person for such Loss to the
                                  fullest extent permitted or required by law,

                             then, notwithstanding any other conditions,
                             provisions or terms of this coverage section to
                             the contrary, any payment by the Company of such   
                             Loss shall be subject to (i) the Insuring Clause 2
                             Deductible Amount set forth in Item 4 of the
                             Declarations for this coverage section and (ii)
                             all of the Exclusions set forth in Subsections 5
                             and 6 of this coverage section.

                             For purposes of this Subsection 9, the shareholder
                             and board of director resolutions of the Insured   
                             Organization shall be deemed to provide
                             indemnification for such Loss to the fullest
                             extent permitted or required by law.

Reporting                10. The Insureds shall, as a condition precedent to 
and Notice                   exercising their rights under this coverage        
                             section, give to the Company written notice as
                             soon as practicable of any Claim made against any
                             of them for a Wrongful Act.

                             If during the Policy Period or Extended Reporting
                             Period (if exercised) an Insured becomes aware of
                             circumstances which could give rise to a Claim and
                             gives written notice of such circumstance(s) to
                             the Company, then any Claims subsequently
                             arising from such circumstances shall be
                             considered to have been reported during the Policy
                             Period or the Extended Reporting Period in which
                             the circumstances were first reported to the
                             Company.

                             The Insureds shall, as a condition precedent to
                             exercising their rights under this coverage
                             section, give to the Company such information and
                             cooperation as it may reasonably require,  
                             including but not limited to a description of the
                             Claim or circumstances, the nature of the alleged
                             potential damage, the names of actual or potential
                             claimants, and the manner in which the Insured
                             first became aware of the Claims or circumstances.

Defense and              11. Subject to this Subsection, it shall be the duty 
and Settlement               of the Insured Persons and not the duty of the 
                             Company to defend Claims made against the Insured
                             Persons.

                             The Insureds agree not to settle any Claim,        
                             incur any Defense Costs or otherwise assume any
                             contractual obligation or admit any liability with
                             respect to any Claim without the Company's
   76

                             consent, which shall not be unreasonably withheld.
                             The Company shall not be liable for any    
                             settlement, Defense Costs, assumed obligation or
                             admission to which it has not consented.

                             The Company shall have the right and shall be
                             given the opportunity to effectively associate
                             with the Insureds in the investigation, defense    
                             and settlement, including but not limited to the
                             negotiation of a settlement, of any Claim that
                             appears reasonably likely to be covered in whole
                             or in part by this coverage section.

                             The Insureds agree to provide the Company with all
                             information, assistance and cooperation which the
                             Company reasonably requests and agree that in the
                             event of a Claim the Insureds will do nothing
                             that may prejudice the Company's position or its
                             potential or actual rights of recovery.

                             Defense Costs shall be part of and not in addition
                             to the Limits of Liability set forth in Item 2
                             of the Declarations for this coverage section, and
                             the payment by the Company of Defense Costs
                             reduces such Limits of Liability.

Allocation               12. If both Loss covered by this coverage section
                             and loss not covered by this coverage section are
                             incurred, either because a Claim against the
                             Insured Persons includes both covered and
                             uncovered matters or because a claim is made
                             against both an Insured Person and others, 
                             including the Insured Organization, and/or the
                             Outside Entity, the Insureds and the Company shall
                             use their best efforts to agree upon a fair and
                             proper allocation of such amount between covered
                             Loss and uncovered loss.

                             If the Insureds and the Company agree on an
                             allocation of Defense costs, the Company shall     
                             advance on a current basis Defense Costs allocated
                             to covered Loss.  If the Insureds and the Company
                             cannot agree on an allocation:

                             (a)  no presumption as to allocation shall
                                  exist in any arbitration, suit or other
                                  proceeding;

                             (b)  the Company shall advance on a current
                                  basis Defense Costs which the Company
                                  believes to be covered under this coverage
                                  section until a different allocation is
                                  negotiated, arbitrated or judicially
                                  determined; and
   77

                             (c)  the Company, if requested by the
                                  Insureds, shall submit the dispute to binding
                                  arbitration.  The rules of the American
                                  Arbitration Association shall apply except
                                  with respect to the selection of the
                                  arbitration panel, which shall consist of one
                                  arbitrator selected by the Insureds, one
                                  arbitrator selected by the Company, and a
                                  third independent arbitrator selected by the
                                  first two arbitrators.

                             Any negotiated, arbitrated or judicially
                             determined allocation of Defense Costs on account
                             of a Claim shall be applied retroactively to all
                             Defense Costs on account of such Claim,    
                             notwithstanding any prior advancement to the
                             contrary.  Any allocation or advancement of
                             Defense Costs on account of a Claim shall not
                             apply to or create any presumption with respect to
                             the allocation of other Loss on account of such
                             Claim.

Other Insurance          13. If the Outside Entity maintains one or more
and Indemnity                insurance policies during the period a Claim 
                             otherwise covered by this coverage section is
                             first made against an Insured Person, then
                             with respect to such Claim this coverage section
                             shall be specifically excess of the amount of
                             payment from such other insurance.

                             If any Loss arising from any Claim made against
                             any Insured Persons is insured under any other
                             valid policy(ies), prior or current, or is
                             indemnified by the Outside Entity or any other
                             organization other than the Insured Organization,
                             then this coverage section shall cover such Loss,
                             subject to its limitations, conditions, provisions
                             and other terms, only to the extent that the
                             amount of such Loss is in excess of the amount of
                             payment from such indemnity or other insurance     
                             whether such other insurance is stated to be
                             primary, contributory, excess, contingent or
                             otherwise, unless such other insurance is written
                             only as specific excess insurance over the limits
                             provided in this coverage section.

                             The Insureds agree that they will use their best
                             efforts to promptly enforce any rights of the      
                             Insured Persons to indemnification by the Outside
                             Entity or any other organization.

CHANGES IN
EXPOSURE

Acquisition or           14. If the Insured Organization (i) acquires 
Creation of                  securities or voting rights in another 
                             organization or creates another organization, 

   78

Another Organization         which as a result of such acquisition or creation
                             becomes a Subsidiary, or (ii) acquires any
                             organization by merger into or consolidation with
                             an Insured Organization, such organization and its
                             Insured Persons shall be Insureds under this
                             coverage section but only with respect to Wrongful
                             Acts committed, attempted, or allegedly    
                             committed or attempted, after such acquisition or
                             creation unless the Company agrees, after
                             presentation of a complete application and all
                             appropriate information, to provide coverage by
                             endorsement for Wrongful Acts committed or
                             attempted, or allegedly committed or attempted, by
                             such Insured Persons prior to such acquisition or
                             creation.

                             If the fair value of all cash, securities, assumed
                             indebtedness and other consideration paid by the
                             Insured Organization for any such acquisition or
                             creation exceeds 10% of the total assets of the
                             Parent Organization as reflected in the Parent
                             Organization's most recent audited consolidated
                             financial statements, the Parent   Organization
                             shall give written notice of such acquisition to
                             the Company as soon as practicable together with
                             such information as the Company may require and
                             shall pay any reasonable additional premium
                             required by the Company.

Acquisition of           15. If (i) the Parent Organization merges into or
Parent Organization          consolidates with another organization, or (ii) 
by Another                   another organization or person or group of 
Organization                 organizations and/or persons acting in concert
                             acquires securities or voting rights which result
                             in ownership or voting control by the other
                             organization(s) or person(s) of more than 50% of
                             the outstanding securities representing the
                             present right to vote for election of directors of 
                             the parent Organization, coverage under this
                             coverage section shall continue until termination
                             of this coverage section, but only with respect to
                             Claims for Wrongful Acts committed, attempted, or
                             allegedly committed or attempted by Insured
                             Persons prior to such merger, consolidation or
                             acquisition.  The Parent Organization shall give
                             written notice of such merger, consolidation or
                             acquisition as soon as practicable, together with
                             such information as the Company may require.

Cessation of             16. In the event an organization ceases to be a
Subsidiaries                 Subsidiary before or after the Inception Date of
                             this coverage section, coverage with respect to
                             such Subsidiary and its Insured Persons shall
                             continue until termination of this coverage
                             section, but only with respect to Claims for
                             Wrongful Acts committed, attempted or allegedly
                             committed or attempted prior to the date such
                             organization ceased to be a Subsidiary.
   79

SCOPE OF COVERAGE        17. The coverage under this coverage section
                             shall not be construed under any circumstance to
                             extend to any Outside Entity or to any director,
                             officer, trustee, governor or other executive or
                             employee of any Outside Entity, other than the
                             Insured Person in his Outside Directorship.

REPRESENTATIONS          18. In granting coverage to any one of the Insureds, 
AND SEVERABILITY             the Company has relied upon the declarations and
                             statements in the written application for this
                             coverage section and upon any declarations and
                             statements in the original written application
                             submitted to another insurer in respect of the
                             prior coverage incepting as of the Continuity Date
                             set forth in Item 9 of the Declarations for this
                             coverage section.  All such declarations and
                             statements are the basis of such coverage and
                             shall be considered as incorporated in and
                             constituting part of this coverage section.

                             Such written application(s) for coverage
                             shall be construed as a separate application for
                             coverage by each of the Insured Persons.  With
                             respect to the declarations and statements
                             contained in such written application(s) for
                             coverage, no statement in the application or
                             knowledge possessed by any Insured Person shall be
                             imputed to any other Insured Person for the
                             purpose of determining if coverage is available.

DEFINITIONS              19. When used in this coverage section:

                             Claim means:

                             (i)   a written demand for monetary damages,

                             (ii)  a civil proceeding commenced by the service
                                   of a complaint or similar pleading,

                             (iii) a criminal proceeding commenced by a
                                   return of an indictment, or

                             (iv)  a formal administrative or regulatory
                                   proceeding commenced by the filing of a
                                   notice of charges, formal investigative order
                                   or similar document,

                             against any Insured Person for a Wrongful Act,
                             including any appeal therefrom.

                             Defense Costs means that part of Loss consisting
                             of reasonable costs, charges, fees (including but
                             not limited to attorney's 
                             
   80
                             fees and experts' fees) and expenses (other than 
                             regular or overtime wages, salaries or fees of 
                             the directors, officers or employees of the 
                             Insured Organization) incurred in defending 
                             or investigating Claims, and the premium 
                             for appeal, attachment or similar bonds.

                             Financial Impairment means the status of the
                             Insured Organization resulting from (i) the
                             appointment by any state or federal official,
                             agency or court of any receiver, conservator,
                             liquidator, trustee, rehabilitator or similar
                             official to take control of, supervise, manage or
                             liquidate the Insured Organization, or (ii) the
                             Insured Organization becoming a debtor in
                             possession.

                             Insureds, either in the singular or plural, means
                             the Insured Organization and any Insured Persons.

                             Insured Organization means, collectively, those
                             organizations designated in Item 5 of the
                             Declarations for this coverage section.

                             Insured Persons, either in the singular or plural,
                             means any one or more of those persons designated
                             in Item 6 of the Declarations for this coverage
                             section.

                             Interrelated Wrongful Acts means all causally
                             connected Wrongful Acts.

                             Loss means the total amount which any Insured
                             Person becomes legally obligated to pay on account
                             of each Claim and for all Claims in each Policy
                             Period and the Extended Reporting Period, if
                             exercised, made against them for Wrongful Acts for
                             which coverage applies, including, but not limited
                             to, damages, judgments, settlements, costs and
                             Defense Costs.

                             Loss does not include (i) any amount not
                             indemnified by the Insured Organization for which
                             the Insured Person is absolved from payment by
                             reason of any covenant, agreement or court order,
                             (ii) fines or penalties imposed by law or the
                             multiple portion of any multiplied damage award,
                             or (iii) matters uninsurable under the law
                             pursuant to which this coverage section is
                             construed.

                             Non-Profit Outside Entity means any non-profit
                             corporation, community chest, fund or foundation
                             that is not included in the definition of Insured
                             Organization and that is exempt from 
                             
   81
                             federal income tax as an organization described 
                             in Section 501(c)(3) of the Internal Revenue 
                             Code of 1986, as amended.

                             Outside Directorship means the position of
                             director, officer, trustee, governor or equivalent
                             executive position held by any Insured Person in
                             an Outside Entity if service in such position was
                             with the knowledge and consent or at the request
                             of the  Insured Organization.

                             Outside Entity means a Non-Profit Outside Entity
                             or a Scheduled Outside Entity.

                             Pollutants means any substance located anywhere in
                             the world exhibiting any hazardous characteristics
                             as defined by, or identified on a list of
                             hazardous substances issued by, the United States
                             Environmental Protection Agency or a state,
                             county, municipality or locality counterpart
                             thereof.  Such substances shall include, without
                             limitation, solids, liquids, gaseous or thermal
                             irritants, contaminants or smoke, vapor, soot,
                             fumes, acids, alkalis, chemicals or waste
                             materials.  Pollutants shall also mean any other
                             air emission, odor, waste water, oil or oil
                             products, infectious or medical waste, asbestos or
                             asbestos products and any noise.

                             Scheduled Outside Entity means any organization
                             listed in a Scheduled Outside Entity Endorsement
                             to this policy.

                             Subsidiary, either in the singular or plural,
                             means any organization in which more than 50% of
                             the outstanding securities or voting rights
                             representing the present right to vote for
                             election of directors is owned or controlled,
                             directly or indirectly, in any combination, by one
                             or more Insured Organizations.

                             Wrongful Act means any error, misstatement,
                             misleading statement, act, omission, neglect, or
                             breach of duty committed, attempted, or allegedly
                             committed or attempted, by an Insured Person,
                             individually or otherwise, in an Outside
                             Directorship, or any matter claimed against him
                             solely by reason of his serving in an Outside
                             Directorship.
   82
                          EXECUTIVE PROTECTION POLICY

                                                                     ENDORSEMENT

Coverage Section: OUTSIDE DIRECTORSHIP        Company: FEDERAL INSURANCE COMPANY

Effective date of                             Endorsement No.  1
this endorsement: DECEMBER 01, 1994

                                              To be attached to and form part of
                                              Policy No.  8137-71-31-A

Issued to:        BOLT BERANEK & NEWMAN INC.


- --------------------------------------------------------------------------------


It is agreed that Item 4 of the Declarations for this coverage section is       
amended as set forth below:


               OUTSIDE ENTITY                 Insuring Clause 2
                                                 Deductible
                                               
Non-Profit Outside Entities ...............       $25,000.


If two or more deductibles of different amounts apply to a single Loss, the
highest of such deductible amounts shall apply to such Loss.


ALL OTHER TERMS AND CONDITIONS REMAIN UNCHANGED.


                                                       Authorized Representative



                                                                Date
   83

                          EXECUTIVE PROTECTION POLICY

                                                                     ENDORSEMENT

Coverage Section: OUTSIDE DIRECTORSHIP       Company: FEDERAL INSURANCE COMPANY 

Effective date of                            Endorsement No.  2
this endorsement: DECEMBER 01, 1994

                                             To be attached to and form part of
                                             Policy No.  8137-71-31-A

Issued to:        BOLT BERANEK & NEWMAN INC.


- --------------------------------------------------------------------------------


It is agreed that the following Insured Persons serving in the position of
director, officer, trustee, governor or equivalent executive position in the
following respective organizations shall be serving a Scheduled Outside
Entity:


Insured            Outside             Pending or         Continuity
Person             Entity              Prior Date         Date

                                                 
Gerald Davidson    Dantel Corporation  12/01/90           12/01/90



ALL OTHER TERMS AND CONDITIONS REMAIN UNCHANGED.


                                                       Authorized Representative



                                                                Date





   84
LLOYD'S POLICY

We, Underwriting Members of the syndicates whose definitive numbers and
proportions are shown in the Table attached hereto (hereinafter referred to as
"the Underwriters"), hereby agree, in consideration of the payment to Us by or  
on behalf of the Assured of the premium specified in the Schedule, to insure
against loss, including but not limited to associated expenses specified
herein, if any, to the extent and in the manner provided in this Policy.

The Underwriters hereby bind themselves severally and not jointly, each for his
own part and not one for another, and therefore each of the Underwriters (and
his heirs, Executors and Administrators ) shall be liable only for his own
share of his syndicate's proportion of any such loss and of any such
expenses.  The identity of each of the Underwriters and the amount of his share
may be ascertained by the Assured or the Assured's representative on
application to Lloyd's Policy Signing Office, quoting the Lloyd's Policy
Signing Office number and date shown in the Table.

If the assured shall make any claim knowing the same to be false or fraudulent,
as regards amount or otherwise, this Policy shall become void and all claim
hereunder shall be forfeited.

In Witness whereof the General Manger of Lloyd's Policy Signing Office has
signed this Policy on behalf of each of us.





s/LLOYD'S POLICY SIGNING OFFICE
GENERAL MANAGER



   85


                                     EXCESS

                           DIRECTORS AND OFFICERS AND

                          COMPANY REIMBURSEMENT POLICY
   86

                                  DECLARATIONS
                       EXCESS DIRECTORS AND OFFICERS AND
                     COMPANY REIMBURSEMENT INDEMNITY POLICY
                                    DOXS '89


NOTICE:   THIS POLICY SUBJECT TO ITS TERMS APPLIES TO ANY CLAIM MADE AGAINST
THE DIRECTORS AND OFFICERS DURING THE POLICY PERIOD.  THE LIMIT OF LIABILITY
AVAILABLE TO PAY DAMAGES OR SETTLEMENTS SHALL BE REDUCED AND MAY BE EXHAUSTED
BY AMOUNTS INCURRED AS REASONABLE AND NECESSARY LEGAL FEES AND EXPENSES IN
DEFENDING THE DIRECTORS AND OFFICERS.  THIS POLICY DOES NOT PROVIDE FOR ANY
DUTY BY UNDERWRITERS TO DEFEND THOSE INSURED HEREUNDER.

These Declarations along with the completed signed Application, including
attachments, and the Policy with Endorsements shall constitute the contract
between those insured hereunder and Underwriters.

POLICY NO.     757/FD940716

Item A.        Name Insured:            BOLT BERANEK AND NEWMAN, INC.

               Principal Address:       150 CambridgePark Drive
                                        Cambridge
                                        Massachusetts 02140
                                        USA

Item B.        Policy Period:

               From 1st December 1994 to 1st December 1995 both days at 
               12:01 a.m. Local Standard Time At The Principal Address Stated 
               in Item A.

Item C.        Limit of Liability:      US $5,000,000 in the aggregate each
                                        Policy year.

Item D.        Premium:                 US $63,004.83 part of US $65,000.00

Item E.        Notification to Underwriters pursuant to Clause V. shall be
               given to Mr. K. Hanson, Hanson and Peters, 311 South Wacker
               Drive, Suite 5500, Chicago, Illinois 60606.

   87

Item F.   Form numbers of endorsements attached at issuance:

          NMA 1256 - Nuclear Incident Exclusion Clause
          NMA 1477 - Radioactive Contamination Exclusion Clause
          11.01 - Prior and Pending Litigation Exclusion

Item G.   Primary Policy:

          Primary Insurer:                     Chubb Group
          Policy No:                           8137-71-31
          Limits of Liability:                 US $3,000,000
          Retentions/Deductibles:              Nil/Nil/US $1,000,000
          Participation/Co-Insurance:          None
          Policy Period:                       From 1st December 1994
                                               To   1st December 1995
                                               
Item H.   Underlying Excess Policies:

          First Underlying Excess Insurer:     St Paul Fire and Marine Insurance
                                               Company
          Policy No:                           900DX0103
          Limits of Liability:                 US $5,000,000
          Retentions/Deductibles:              As Primary
          Participation/Co-Insurance:          None
          Policy Period:                       From  1st December 1994
                                               To    1st December 1995
                                               
          Second Underlying Excess Insurer:    Chubb Group Inc
          Policy No:                           8137-71-32
          Limits of Liability:                 US $2,000,000
          Retentions/Deductibles:              As Primary
          Participation/Co-Insurance:          None
          Policy Period:                       From  1st December 1994
                                               To    1st December 1995
                                               
          Third Underlying Excess Insurer:     Chicago Underwriter Group Inc
          Policy No:                           CUG24032
          Limits of Liability:                 US $5,000,000
          Retentions/Deductibles:              As Primary
          Participation/Co-Insurance:          None
          Policy Period:                       From  1st December 1994
                                               To    1st December 1995

Dated in London:
   88

                       EXCESS DIRECTORS AND OFFICERS AND
                     COMPANY REIMBURSEMENT INDEMNITY POLICY

In consideration of the payment of the premium, in reliance upon the statements
in the Application attached hereto and made a part hereof, subject to the
Declarations made a part hereof and subject to all of the terms of this Policy,
Underwriters agree as follows:-

I.   CONFORMANCE WITH PRIMARY POLICY

     Except as regards:

     (1)  the premium, and

     (2)  the amounts and limits of liability, and

     (3)  the subject matter of Clauses II, III, IV, V, VI, and VII

     (4)  as otherwise may be provided herein,

this Policy is subject to the same insuring clauses, definitions, terms,
conditions, exclusions and other provisions as those set forth in the Primary
Policy as described in the materials submitted to Underwriters in connection
with the application for this Policy.  No changes to the Primary Policy as so
described shall be binding upon Underwriters under this Policy unless
specifically endorsed hereon.

II.  DEFINITIONS

     The following terms whenever used in this Policy shall have the meanings   
     indicated.

     A.   "Primary Policy" shall mean the policy identified in Item G. of the
          Declarations.

     B.   "Underlying Policies" shall mean the policies identified in Items G.
          and H. of the Declarations.

     C.   "Underlying Limit of Liability" shall mean the combined limits of
          liability of the Underlying Policies as set forth in Item G. and H. of
          the Declarations, less any reduction or exhaustion of said limits of
          liability due to payment of loss under said policies.

III. MAINTENANCE OF UNDERLYING POLICIES

     This Policy provides excess coverage only.  It is a condition precedent to
     the 

   89

     coverage afforded under this Policy that those insured hereunder maintain
     the Underlying Policies with retentions/deductibles, participation/co-
     insurance and limits of liability (subject to reduction or exhaustion 
     as a result of loss payments), as set forth in items G. and H. of the 
     Declarations.  This Policy does not provide coverage for any loss
     not covered by the Underlying Policies except and to the extent that such
     loss is not paid under the Underlying Policies solely by reason of the
     reduction or exhaustion of the Underlying Limits of Liability through
     payments of loss thereunder.  In the event the insurer under one or more of
     the Underlying Policies fails to pay loss in connection with any claim as a
     result of the insolvency, bankruptcy or liquidation of said insurer, then
     those insured hereunder shall be deemed self-insured for the amount of the
     limit of liability of said insurer which is not paid as a result of such
     insolvency, bankruptcy or liquidation.

IV.  LIMIT OF LIABILITY

     A.   Subject to Clause IV.B., Underwriters shall be liable to pay loss
          which is in excess of

          (1)  The Underlying Limit of Liability plus

          (2)  the applicable retention or deductible under the Primary Policy

          up to the Limit of Liability as shown under Item C. of the    
          Declarations resulting from each claim made against the directors
          and officers.

     B.   The amount shown in Item C. of the Declarations shall be the
          maximum aggregate Limit of Liability of Underwriters for all loss
          resulting from all claims made against the directors and officers
          during the Policy Period, together with all claims made against
          the directors and officers which, in accordance with Clause IV.E. or
          Clause V.B., shall be deemed to have been made during the Policy 
          Period.

     C.   Underwriters shall be liable hereunder only after the insurers under
          each of the Underlying Policies have paid or have been held liable to 
          pay the full amount of the Underlying Limit of Liability.

     D.   Subject to Clause IV.B., in the event of the reduction or exhaustion
          of the Underlying Limit of Liability by reason of payment of loss,
          this  Policy shall:

          (1)  in the event of reduction, pay excess of the reduced limits and

          (2)  in the event of exhaustion, continue in force as primary
               insurance; provided, however that in the case of exhaustion
   90

               this Policy shall only pay excess of the retention or deductible 
               applicable to the Primary Policy as set fort in Item G. of the
               Declarations, which shall be applied to any subsequent loss in 
               the same manner as specified in this Primary Policy.

     E.   More than one claim involving the same wrongful act or related
          wrongful acts of one or more directors and officers shall be deemed to
          constitute a single claim and such single claim shall be deemed to
          have been made at the earliest of the following times:

          (1)  the time the earliest claim involving the same wrongful act or
               related wrongful acts is first made, or

          (2)  the time the claim involving the same wrongful act or related
               wrongful acts shall be deemed to have been made pursuant to
               Clause V.B., if applicable.

V.   NOTIFICATION

     A.  If during the Policy period or any optional extension period, if
         applicable, any claim is made against any director or officer, those
         insured hereunder shall, as a condition precedent to their right to be
         reimbursed under this Policy, give to Underwriters notice in writing
         as soon as practicable of any such claim, but in no event later than
         sixty (60) days after such claim is first made.

     B.  If during the Policy Period or any optional extension period, if
         applicable, those insured hereunder first become aware of a specific
         wrongful act, and if those insured hereunder shall, during such
         period, give written notice to Underwriters as soon as practicable of:

         (1)  the specific wrongful act, and

         (2)  the consequences which have or may result herefrom, and

         (3)  the circumstances by which those insured hereunder first
              became aware thereof,

         then any claim not otherwise excluded by the terms of this Policy
         subsequently made against the directors and officers arising out of
         such wrongful act or any related wrongful act shall be deemed for the
         purposes of this Policy to have been made at the time such notice was
         first given.

     C.  Notice to Underwriters provided for in this Clause V. shall be given
         to 
   91
         the firm shown under Item E. of the Declarations.

VI.  WARRANTY CLAUSE

     It is warranted that the particulars and statements contained in the
     application for this Policy or contained in any application for any policy
     issued by Underwriters of which this Policy is a renewal thereof, a copy of
     which is attached hereto, and any material submitted therewith (which shall
     be retained on file by Underwriters and be deemed attached hereto, as if
     physically attached hereto), are the basis of this Policy and are to be
     considered as incorporated in to and constituting a part of this Policy.
     This Policy shall be deemed to be a single unitary contract and not a
     severable contract of insurance or a series of individual contracts of
     insurance with each of the persons or entities insured hereunder.

VII. SERVICE OF SUIT

     It is agreed that in the event of the failure of the Underwriters heron to
     pay any amount claimed to be due hereunder, the Underwriters hereon at the
     request to the Insured (or Reinsured), will submit to the jurisdiction of a
     Court of competent jurisdiction within the United States.  Nothing in this
     Clause constitutes or should be understood to constitute a waiver of
     Underwriters' rights to commence an action in any court of competent
     jurisdiction in the United States, to remove an action to a United States
     District Court, or to seek a transfer of a case to another court as        
     permitted by the laws of the United States or of any State in the United
     States.  It is further agreed that service of process in such suit may be
     made upon Mendes and Mount, 750 Seventh Avenue, New York, N.Y.  10019-6829,
     U.S.A., and that in such suit instituted against any one of them upon this
     contract, Underwriters will abide by the final decision of such court or of
     any Appellate Court in the event of an appeal.

     The above-named are authorized and directed to accept service of process on
     behalf of Underwriters in any such suit and/or upon the request of the     
     Insured (or Reinsured) to give a written undertaking to the Insured (or
     Reinsured) that they will enter a general appearance upon Underwriters'
     behalf in the event such a suit shall be instituted.

     Further, pursuant to the statute of any state, territory or district of the
     United States which makes provision therefore, Underwriters hereon hereby
     designate the Superintendent, Commissioner or Director of Insurance or     
     other officer specified for that purpose in the statute, or his successor
     or successors in office, as their true and lawful attorney upon whom may be
     served any lawful process in any action, suit or proceeding instituted by
     or on behalf of the Insured (or Reinsured) or any beneficiary hereunder
     arising out 
   92


     of this contract of insurance (or reinsurance), and hereby designate the
     above-named as the person to whom the said officer is authorized to mail
     such process or a true copy thereof.

   93

U.S.A.

NUCLEAR INCIDENT EXCLUSION CLAUSE - LIABILITY - DIRECT (BROAD)
           (Approved by Lloyd's Underwriters' Non-Marine Association)

For attachment to insurances of the following classifications in the U.S.A.,
its Territories and Possessions, Puerto Rico and the Canal Zone:-
     Owners, Landlords and Tenants Liability, Contractual Liability, Elevator
     Liability, Owners or Contractors (including railroad) Protective Liability,
     Manufacturers and Contractors Liability, Product Liability, Professional
     and Malpractice Liability, Storekeepers Liability, Garage Liability,
     Automobile Liability (including Massachusetts Motor Vehicle or Garage
     Liability), 
not being insurances of the classifications to which the Nuclear Incident 
Exclusion Clause - Liability - Direct (Limited) applies.


THIS POLICY*
                                                                does not apply:-
1.   Under any Liability Coverage, to injury, sickness, disease, death or
     destruction

     (a)  with respect to which an insured under the policy is also an insured
          under a nuclear energy liability policy issued by Nuclear Energy
          Liability Insurance Association, Mutual Atomic Energy Liability
          Underwriters or Nuclear Insurance Association of Canada, or would be
          an insured under any such policy but for its termination upon
          exhaustion of its limit of liability; or
     (b)  resulting from the hazardous properties of nuclear material and with
          respect to which (1) any person or organization is required to
          maintain financial protection pursuant to the Atomic Energy Act of
          1954, or any law amendatory thereof, or (2) the insured is, or had
          this policy not been issued would be, entitled to indemnity from the
          United States of America, or any agency thereof, under any agreement
          entered into by the United States of America, or any agency thereof,
          with any person or organization.

2.   Under any Medical Payments Coverage, or under any Supplementary Payments
     Provision relating to immediate medical or surgical relief, to expenses
     incurred with respect to bodily injury, sickness, disease or death
     resulting from the hazardous properties of nuclear material and arising out
     of the operation of a nuclear facility by any person or organization.

3.   Under any Liability  coverage, to injury, sickness, disease, death or
     destruction resulting from the hazardous properties of nuclear material, if
   94

     (a)  the nuclear material (1) is at any nuclear facility owned by, or
          operated by or on behalf of, an insured or (2) has been discharged or 
          dispersed therefrom;
     (b)  the nuclear material is contained in spent fuel or waste at any time
          possessed, handled, used, processed, stored, transported or disposed
          of by or on behalf of an insured; or
     (c)  the injury, sickness, disease, death or destruction arises out of the
          furnishing by an insured of services, materials, parts or equipment in
          connection with the planning construction, maintenance, operation or 
          use of any nuclear facility, but if such facility is located within
          the   United States of America, its territories or possessions or
          Canada, this exclusion (c) applies only to injury to or destruction of
          property at such nuclear facility.

4.   As used in this endorsement:
     "HAZARDOUS PROPERTIES" include radioactive, toxic or explosive properties;
     "NUCLEAR MATERIAL" means source material, special nuclear material or
     byproduct material; "SOURCE MATERIAL", "SPECIAL NUCLEAR MATERIAL", and
     "BYPRODUCT MATERIAL" have the meanings given them in the Atomic Energy Act
     1954 or in any law amendatory thereof; "SPENT FUEL" means any fuel element
     or fuel component, solid or liquid, which has been used or exposed to
     radiation in a nuclear reactor: 'WASTE" means any waste material (1)
     containing byproduct material and (2) resulting from the operation by any
     person or organization of any nuclear facility included within the
     definition of nuclear facility under paragraph (a) or (b) thereof:
     "NUCLEAR FACILITY" means

     (a)  any nuclear reactor,
     (b)  any equipment or device designed or used for (1) separating the
          isotopes of uranium or plutonium, (2) processing or utilizing spent
          fuel, or (3) handling, processing or packaging waste,
     (c)  any equipment or device used for the processing, fabricating or
          alloying  of special nuclear material if at any time the total amount
          of such material in the custody of the insured at the premises
          where such equipment or device is located consists of or contains more
          than 25 grams of plutonium or uranium 233 or any combination
          thereof, or more than 250 grams of uranium 235,
     (d)  any structure, basin, excavation, premises or place prepared or
          used for the storage or disposal of waste, and includes the site on
          which any of the foregoing is located, all operations conducted on
          such site and all premises used for such operations; "NUCLEAR REACTOR"
          means any apparatus designed or used to sustain nuclear fission
          in a self-supporting chain reaction or to contain a critical mass of
          fissionable material.
   95

     With respect to injury to or destruction of property, the word "INJURY" or
     "DESTRUCTION" includes all forms of radioactive contamination of property.
     It is understood and agreed that, except as specifically provided in the
     foregoing to the contrary, this clause is subject tot the terms,
     exclusions, conditions and limitations of the Policy to which it is
     attached.

*NOTE:- As respects policies which afford liability coverages and other forms
     of coverage in addition, the words underlined should be amended to 
     designate the liability coverage to which this clause is to apply.

17/3/60
N.M.A. 1256
   96

U.S.A.
            RADIOACTIVE CONTAMINATION EXCLUSION CLAUSE - LIABILITY -
                                     DIRECT

           (Approved by Lloyd's Underwriters' Non-Marine Association)

For attachment (in addition to the appropriate Nuclear Incident Exclusion       
Clause - Liability - Direct) to liability insurances affording worldwide 
coverage.

In relation to liability arising outside the U.S.A. its Territories or
Possessions, Puerto Rico or the Canal Zone, this Policy does not cover any
liability of whatsoever nature directly or indirectly caused by or contributed  
to by or arising from ionizing radiations or contamination by radioactivity from
any nuclear fuel or from any nuclear waste from the combustion of nuclear fuel.

13/2/64
N.M.A. 1477
   97
                     PRIOR AND PENDING LITIGATION EXCLUSION

                                    (11.01)

In consideration of the premium charged for this Policy, it is hereby understood
and agreed that Underwriters shall not be liable to make any payment in
connection with any Claim:

     Based upon, arising out of, directly or indirectly resulting from or in    
     consequence of or in any way involving;

     (1)  any prior and/or pending litigation as of 1st December 1993, or

     (2)  any fact, circumstance, situation, transaction or event underlying or
          alleged in such litigation,

     regardless of the legal theory upon which such Claim is predicated.
   98

                                  LINES CLAUSE

This Insurance, being signed for 96.9305%, of 100% insures only that proportion
of any loss, whether total or partial, including but not limited to that        
proportion of associated expenses, if any, to the extent and in the manner
provided in this Insurance.

The percentages signed in the Table are percentages of 100% of the amount (s) of
Insurance stated herein.


N.M.A. 2419


                            SEVERAL LIABILITY NOTICE

The subscribing insurers' obligations under contracts of insurance to which they
subscribe are several and not joint and are limited solely to the extent of
their individual subscriptions.  The subscribing insurers are not responsible   
for the subscription of any co-subscribing insurer who for any reason does not
satisfy all or part of its obligations.


LSW 1001 (Insurance) 08/94
   99
Date:
Policy No:  757/FD940716

                                  THE SCHEDULE

The Insured:                  BOLT BERANEK AND NEWMAN INC.

Premium:                      US $1,995.17 part of US $65,000.00

Limits of Liability:          3.0695% of
                              US $5,000,000 in the aggregate each policy
                              year which is excess of US $15,000,000 which
                              in turn is excess of :-

                              US$NIL/US$NIL Directors and Officers
                              Liability

                              US $1,000,000 Reimbursement Liability.


The Interest Insured:         EXCESS DIRECTORS AND OFFICERS
                              LIABILITY AND EXCESS 
                              REIMBURSEMENT FOR DIRECTORS AND
                              OFFICERS LIABILITY.
                              As more fully set forth in the co-insuring
                              Lloyd's policy.

Period of Insurance;

FROM: 1st December 1994  TO:  1st December 1995 BOTH DAYS AT 12:01 AM LOCAL
STANDARD TIME AND FOR SUCH FURTHER PERIOD OR PERIODS AS MAY BE MUTUALLY AGREED.


                               COINSURANCE CLAUSE

It is warranted that this Policy shall run concurrently with and be subject to
the same terms, provisions, and limitations as are contained in Policy No.
757/FD940716 issued by certain underwriting members at Lloyd's of London
covering the identical subject matter and risk.

   100





               LIRMA
               COMPANY
THE INSURERS   NUMBER         PROPORTION          REFERENCE
                                         
Zurich
RE (UK)
Limited        Z4508          3.0695%             Z70003635494






                            SEVERAL LIABILITY NOTICE

The subscribing insurers' obligations under contracts of insurance to which they
subscribe are several and not joint and are limited solely to the extent of     
their individual subscriptions.  The subscribing insurers are not responsible
for the subscription of any co-subscribing insurer who for any reason does not
satisfy all or part of its obligations.


LSW  1001 (Insurance)  8/94
   101

J. & H. 757                   Dated in London:

Endorsement No.01 attaching to and forming part of LIRMA Policy No.
757/FD940716


NAME OF ASSURED:    BOLT BERANEK AND NEWMAN, INC.


It is understood and agreed that with effect from 13th December 1994 this policy
shall follow the Predetermined Allocation for Securities Claims Endorsement
attaching to the Primary Policy No. 8137-71-31.


In consequence of the foregoing there is due from the Assured an Additional
Premium of US $ 482.34 part of US$15,714.00


All other terms and conditions remain unchanged.
   102

                                  LIRMA POLICY

IN CONSIDERATION  of the Insured named in the Schedule hereto having paid or
promised to pay the premium stated in the said Schedule to the Insurers named
herein who have hereunto subscribed their names ("the Insurers").

THE INSURERS HEREBY SEVERALLY AGREE each for the proportion set against its own
name to indemnify the Insured or the Insured's Executors and Administrators
against loss, damage or liability to the extent and in the manner set forth
herein.  Provided that the aggregate liability of the Insurers shall not exceed
the Sum Insured or other limits as are set forth in the Schedule.

If the Insured shall make any claim knowing the same to be false or fraudulent,
as regards amount or otherwise, this Policy shall become void and all claim
hereunder shall be forfeited.

IN WITNESS WHEREOF the Director of Policy Signing Services of LONDON INSURANCE
AND REINSURANCE MARKET ASSOCIATION ("LIRMA") has subscribed his name on behalf
of each of the LIRMA Companies and (where the Companies Collective Signing
Agreement ("CCSA") is being implemented) on behalf of the Leading CCSA Company
which is a LIRMA member and authorized to sign this Policy (either itself or by
delegation to LIRMA) on behalf of all the other CCSA Companies.

s/


Date:




   103
                            EXCESS INSURANCE POLICY



                                IMPORTANT NOTICE


               THIS POLICY PROVIDES EXCESS INSURANCE ON A CLAIMS
               MADE BASIS.  ALL CLAIMS MUST BE REPORTED TO THE
               COMPANY EVEN IF THEY DO NOT EXCEED THE AMOUNT OF
               UNDERLYING INSURANCE.  PLEASE READ THE POLICY AND ALL
               ENDORSEMENTS CAREFULLY TO DETERMINE YOUR RIGHTS,
               DUTIES AND WHAT IS AND IS NOT COVERED.
   104


                                  OLD REPUBLIC



                            EXCESS INSURANCE POLICY

In consideration of the payment of premium and in reliance upon the statements
in the Declaration and subject to all the terms of this policy, agrees with the
insured named in the Declarations, to provide coverage as follows:

                               INSURING AGREEMENT

To indemnify the insured for that amount of loss which exceeds the amount of
loss payable by underlying policies described in Declaration 4, but the
company's obligation hereunder shall not exceed the limit of liability stated
in Declaration 5.

                                   CONDITIONS

A. Application of Underlying Insurance  Except as otherwise stated herein, and
   except with respect to (1) any obligation to investigate or defend any claim
   or suit, or (2) any obligation to renew, the insurance afforded by this
   policy shall apply in like manner as the underlying insurance described in
   Declaration 4.

B. Maintenance of Underlying Insurance  It is warranted by the insured that no
   less than the amount of underlying insurance stated in Declaration 4 is
   available to the insured, and that such underlying insurance shall be
   maintained in force during the currency of this policy, except for any
   reduction of the aggregate limits contained therein solely by payment of
   claims in respect to occurrences during the period of this policy and
   covered by such underlying insurance.  Notice of exhaustion of underlying
   insurance shall be given the company as soon as practicable after such
   exhaustion.

C  Loss Payable  Liability of the company with respect to any once occurrence
   shall not attach unless an until the insured, or the insured's underlying
   insurer, has paid the amount of underlying insurance stated in Declaration 4
   and after the insured's liability shall have been made certain by final
   judgment after actual trial, or by written agreement of the insured, the
   claimant and the company.

D. Premium  The premium for this policy shall be stated in Declaration 3.

E. Assistance and Co-operation  The company shall not be called upon to assume
   charge of the settlement or defense of any claim made or proceeding
   instituted against the insured; but the company shall have the right and
   opportunity to associate with the insured in the defense and control of any
   claim or proceeding reasonably likely to involve the company.  In such event
   the insured and the company shall cooperate fully.

F. Expenses  Loss and legal expenses incurred by the insured with the consent
   of the company in the investigation or defense of claims, including court
   costs and interest, shall be borne by both the company and the insured in
   the proportion that each party's share of loss bears to the total amount of
   such loss.  For purposes of this allocation, the insured's share of such
   loss shall include the amount,  if any, of the loss borne by its underlying
   insurer.  Salaries and expenses of the insured's employees shall not be
   considered as part of the above expenses.  Expenses thus paid by 
   105

   the company shall be paid in addition to the limit of liability stated in
   Declaration 5. If, however, expenses are included in the limit of 
   liability of the underlying insurance, then expenses paid by the company
   shall be included in the limit of liability of this policy and not in
   addition thereto.

G. Notice of Occurrence  Upon the happening of an occurrence reasonably likely
   to involve the company hereunder, written notice shall be given as soon as
   practicable to the company or any of its authorized agents as designated in
   Declaration 6.   Such notice shall contain particulars sufficient to
   identify the insured and the fullest information obtainable at the time.

   The insured shall give like notice of any claim made on account of such
   occurrence.  If legal proceedings are begun, the insured, when requested by
   the company, shall forward to it each paper thereon, or a copy thereof,
   received by the insured or the insured's representatives, together with
   copies of reports of investigations made by the insured with respect to such
   claim proceedings.

H. Appeals  In the event the insured or the insured's underlying insurer elects
   not to appeal a judgment which exceeds the underlying insurance, the company
   may elect to do so at its own expense, and shall be liable for the taxable
   costs, disbursements and interest incidental thereto, but in no event shall
   the liability of the company for excess loss exceed the amount set forth in
   Declaration 5.
   106
                                                       Policy Number:  CUG 24032

                                                     Previous Number:  CUG 23731


                     DECLARATIONS - EXCESS INSURANCE POLICY


1.   NAMED INSURED AND ADDRESS:

                    Bolt Beranek and Newman Inc.
                    150 Cambridge Park Drive
                    Cambridge, Massachusetts  02140

2.   POLICY PERIOD: From:   December 1, 1994    To:  December 1, 1995
                    12:01 A.M. STANDARD TIME AT THE NAMED INSURED'S ADDRESS
                    ABOVE.

3.   PREMIUM        $80,000.

4.   UNDERLYING INSURANCE:

     Coverage:                  Directors & Officers Liability Insurance
     Primary Insurer:           Federal Insurance Company
     Policy Number:             8137-71-31-A
     Policy Term:               December 1, 1994 to December 1, 1995
     Limit of Liability:        $3,000,000 annual aggregate
     Retention:                 $0.00 each Director or Officer each loss, but 
                                in no event exceeding $0.00 in the aggregate
                                each loss as respects Directors and     
                                Officers Liability.  $1,000,000 in the
                                aggregate each loss as respects Company
                                Reimbursement Liability.

     First Excess Insurer:      St. Paul Mercury Insurance Company
     Policy Number:             900/DX0103
     Policy Term:               December 1, 1994 to December 1, 1995
     Limit of Liability:        $5,000,000 annual aggregate in excess of the 
                                Limit shown above.

     Second Excess Insurer:     Federal Insurance Company
     Policy Number:             81377132-A
     Policy Term:               December 1, 1994 to December 1, 1995
     Limit of Liability:        $2,000,000 annual aggregate in excess of the 
                                Limits shown above.
   107

5.   LIMIT OF LIABILITY:

     $5,000,000 each claim and aggregate in excess o the total limits of
     underlying insurance stated in Item 4.  All expenses resulting from the    
     investigation and defense of claims to which this policy applies,
     including court costs and interest, shall be included in the  limit of
     liability of this policy and not in addition thereto.

6.   NOTICE OF CLAIM (CONDITION G) TO:

                    CHICAGO UNDERWRITING GROUP, INC.
                    211 West Wacker Drive, Third Floor
                    Chicago, Illinois  60606

7.   ATTACHMENTS:   ORUG-5 (10/88), Endorsements #1, #2, #3, #4, #5, and
                    Application dated October 7, 1994.

Date:  May 10, 1995 ____________________________________________________
                                   Authorized Representative
   108

                            AMENDATORY ENDORSEMENTS


It is agreed that conditions A, B, C, F and G of this policy are deleted and
     replaced by the following:

A.   Application of Underlying Insurance - Except as otherwise stated herein,
     and except with respect to (1) any obligation to investigate or defend any
     claim or suit, or (2) any obligation to renew, this policy shall adopt and
     incorporate by reference the terms, conditions, exclusions and limitations
     of the underlying insurance described in Declaration 4.

B.   Maintenance of Underlying Insurance -  It is warranted by the insured that
     no less than the amount of underlying insurance stated in Declaration 4 is
     available to the insured and that such underlying insurance shall be
     maintained in force during the period of this policy, except or the
     reduction or exhaustion of the aggregate limits contained therein solely
     by payment of loss and/or defense expenses which, except for the amount
     thereof, would be indemnifiable under this policy and which results from
     claims first made against the insured during the period of this policy.

C.   Loss Payable - Liability of the company with respect to any claim shall
     not attach unless and until the insured, or the insured's underlying
     insurer, has paid an amount equal to the underlying insurance stated in
     Declaration 4 and after the insured's liability shall have been made
     certain by final judgment after actual trial or by written agreement of
     the insured, the claimant and the company.

     The insolvency, bankruptcy, receivership or refusal or inability to pay of
     the insured or any underlying insurer shall not operate to lower the
     amount of underlying insurance stated in Declaration 4 or increase the
     company's liability under this policy.  In no event shall the company
     assume the liabilities and/or responsibilities and/or obligations of the
     insured or any underlying insurer.

F.   Expenses - Notwithstanding anything contained in the underlying insurance
     to the contrary, all expenses resulting from the investigation and defense
     of claims to which this policy applies, including court costs and
     interest, shall be included in the limit of liability of this policy and
     not in addition thereto.

G.   Notice of Claims - The insured must give the company, through its
     authorized agent designated in Declaration 6, written notice of any claim
     first made against the insured during the period of this policy whether or
     not the claim exceeds the amount of the underlying insurance.  Such notice
     shall be given within the period of time required by the underlying
     insurance, but in no event shall the notice be given later than sixty (60)
     days after the termination of this policy.  Any notice of claim must
     contain particulars sufficient to identify the insured, the claimant and
     the alleged acts, errors or omissions that caused the claim.

     The insured shall cooperate with the company in providing any information
     that the company may reasonably require, including copies of all demands,
     notices, summonses or legal papers that relate to any claim.

All other terms and conditions of this policy remain unchanged.


This endorsement is a part of the policy and takes effect on the effective date
of the policy, unless another effective date is shown below.


                                      Complete Only When This Endorsement Is Not Prepared with
  Must Be Completed                     the Policy Or Is Not to be Effective with the Policy

ENDT. NO.   POLICY NO.                  ISSUED TO       EFFECTIVE DATE OF THIS ENDORSEMENT
         
   1        CUG 24032


                                     Countersigned by___________________________
                                                      Authorized Representative
   109
                          EXCESS INSURANCE APPLICATION


          It is agreed that this policy is issued in reliance upon
          the statements made in the company's written application,
          a copy of which is attached hereto and made a part hereof,
          and upon the written applications submitted by the
          insureds with respect to the underlying insurance stated
          in Declaration 4 and are to be considered as incorporated
          in and constituting part of this policy.

          It is further agreed that the policy shall not apply to
          liability of any kind based upon, involving or arising out
          of:


               (1)  any claims or suits described or
                    referenced by the insured in answer to
                    questions #10, #11, and #12 of the
                    company's application, or any facts,
                    situations or circumstances alleged
                    therein, or

               (2)  any facts, situations or circumstances
                    described or referenced by the insured in
                    answer to question #13 of the application.





All other terms and conditions of this policy remain unchanged.


This endorsement is a part of the policy and takes effect on the effective date
of the policy, unless another effective date is shown below.



                                      Complete Only When This Endorsement Is Not Prepared with
  Must Be Completed                     the Policy Or Is Not to be Effective with the Policy

ENDT. NO.   POLICY NO.                  ISSUED TO       EFFECTIVE DATE OF THIS ENDORSEMENT
         
   2        CUG 24032


                                     Countersigned by___________________________
                                                      Authorized Representative

   110
     It is understood and agreed that the Company shall not be liable to make
     any payment for loss in connection with any claim made against the
     Directors or Officers based upon, arising out of, in consequence of or in
     any way attributable to litigation, arbitration or administrative
     proceeding prior to or pending as of December 1, 1993 involving the named
     insured and/or any Director or Officer of the named insured and/or any
     Subsidiary of the named insured or arising out of any facts or
     circumstances underlying or alleged in any such prior or pending
     litigation, arbitration or administrative proceeding.





All other terms and conditions of this policy remain unchanged.


This endorsement is a part of the policy and takes effect on the effective date
of the policy, unless another effective date is shown below.



                                      Complete Only When This Endorsement Is Not Prepared with
  Must Be Completed                     the Policy Or Is Not to be Effective with the Policy

ENDT. NO.   POLICY NO.                  ISSUED TO       EFFECTIVE DATE OF THIS ENDORSEMENT
         
   3        CUG 24032


                                     Countersigned by___________________________
                                                      Authorized Representative
   111
     If the insurer shall cancel this policy for any reason, except for the
     nonpayment of premium, or refuse to renew this policy, the Company shall
     have the right, upon payment within ten (10) days after the effective date
     of such cancellation or non-renewal of an additional premium of 75% of the
     annual premium hereunder to an extension of the insurance granted by this
     policy in respect of any claim or claims made against the Directors or
     Officers during the period of twelve (12) months after the date of such
     cancellation or non-renewal, but only in respect of any Wrongful Act
     committed before the date of such cancellation or non-renewal.  Such twelve
     (12) month period is herein after referred to as "extended discovery
     period".





All other terms and conditions of this policy remain unchanged.


This endorsement is a part of the policy and takes effect on the effective date
of the policy, unless another effective date is shown below.



                                      Complete Only When This Endorsement Is Not Prepared with
  Must Be Completed                     the Policy Or Is Not to be Effective with the Policy

ENDT. NO.   POLICY NO.                  ISSUED TO       EFFECTIVE DATE OF THIS ENDORSEMENT
         
   4        CUG 24032


                                     Countersigned by___________________________
                                                      Authorized Representative

   112
     In consideration of the premium charged it is understood and agreed that
     General Condition Clause J. of the policy wording, Cancellation, is amended
     by deleting the words "thirty (30)" and replacing with "sixty (60)".





All other terms and conditions of this policy remain unchanged.


This endorsement is a part of the policy and takes effect on the effective date
of the policy, unless another effective date is shown below.



                                      Complete Only When This Endorsement Is Not Prepared with
  Must Be Completed                     the Policy Or Is Not to be Effective with the Policy

ENDT. NO.   POLICY NO.                  ISSUED TO       EFFECTIVE DATE OF THIS ENDORSEMENT
         
   5        CUG 34032


                                     Countersigned by___________________________
                                                      Authorized Representative
   113
                APPLICATION FOR DIRECTORS AND OFFICERS LIABILITY
                 AND COMPANY REIMBURSEMENT LIABILITY INSURANCE
        (for non financial institutions operating on a for-profit basis)

1. Name of Organization:        Bolt Beranek and Newman, Inc.
   Principal Address:           150 Cambridge Park Drive
                                Cambridge, MA  02140

2. (a)  Date since the Company has continuously carried on business:  
        1948 as Partnership
   (b)  State of Incorporation:  Massachusetts  
        Date of Incorporation 1953 as Corporation.
   (c)  Nature of business:  Consulting and Diversified Technologies

3. Officer designated to receive notices pertaining to this insurance:  John
   Montjoy, Vice President and Corporate Counsel

4. Stock Ownership:
   (a)  Number of common shares outstanding:    1,665,680
   (b)  Number of common stock shareholders:    2,225 (as of 6/30/94)
   (c)  Number of common shares owned (directly and beneficially) by directors:
            See Page 17 of Proxy
   (d)  Number of common shares owned (directly and beneficially) by officers
        who o are not directors:  See Page 17 of Proxy
   (e)  Name and percentage of holds of any shareholder owning 5% or more of the
        common shares (directly or beneficially):    See Page 17 of Proxy
   (f)  Describe fully any other securities that are convertible to common 
        stock: 6% convertible subordinated debentures due 2012

5. (a)  Latest Moody's or Standard and Poor's bond rating:    N/A
   (b)  Has this rating changed in the last 12 months?     (  ) YES   (  ) NO
                (If Yes, please attach full details).

6. Has the Company under consideration at the present time or has it considered
   within the last 6 months or does it contemplate any acquisitions, leveraged
   buy outs, tender offers or mergers?                     (  ) YES   (  ) NO
                (If Yes, please attach full details).

7. Has the Company filed or contemplated filing any registration statement with
   the Securities and Exchange Commission within the past 18 months or within
   the next 12 months for a public offering for securities? (  ) YES  (x) NO
   (If Yes, please attach full details including copy of prospectus or
    registration statement).
   From time to time company has under consideration acquisition or disposition
   of one or more entities or business units.

8. (a)Within the last 18 months has the Company or any of its subsidiaries made
      or joined in a Schedule 13-D filing with the Securities and Exchange
      Commission with respect to the ownership of the securities of another
      corporation.                                            (   ) YES   (x) NO
   (b)Is the Company aware that any person, corporation, or other entity has
      made a Schedule 13-D filing with  respect to the ownership of the
      Securities of the Company or any of its subsidiaries?   (   ) YES   (x) NO
   (If yes to either of the above, please furnish copies of all filings.)

9. Is coverage proposed for directors and officers of subsidiaries?  See
   Attached Schedule                                       (x) YES    (  ) NO 
   (If Yes, please attach a separate sheet listing the name of each
   subsidiary, the date acquired or created, the percentage of ownership by the
   Company, any minority shareholders and type of operation.)

10. Has the Company or any of its directors or officers been involved in any of
    the following:
    (a)  any anti-trust, copywrite or patent litigation?     (  ) YES   (x) NO
    (b)  any civil or criminal action or administrative proceeding charging a
         violation of any federal or state security law or regulation?
                                                             (  ) YES   (x) NO
    (c)  any representative actions, class actions or derivative suits?
                                                             (  ) YES   (x) NO
         (If Yes, please attach full details).
   114
I.      SUBROGATION In the event of payment under this policy, the company will
        participate with the insured and any underlying insurer in the exercise
        of all the insured's rights of recovery against any person or
        organization liable therefor.  Recoveries shall be applied first to
        reimburse any interest (including the insured) that may have paid any
        amount, with respect to liability in excess of the limit of the
        company's liability hereunder, then to reimburse the company up to the
        amount paid hereunder, and lastly to reimburse such interests (including
        the insured), to whom this insurance is excess as are entitled to clam
        the residue, if any.  Such expenses incurred in the exercise of rights
        of recovery shall be apportioned among all interests in the ratio of
        their respective losses for which recovery is sought.

J.      CANCELLATION  This policy may be cancelled by the named insured by
        surrender thereof to the company or any of its authorized agents, or by
        mailing to the company written notice stating when thereafter such
        cancellation shall be effective.  If cancelled by the named insured, the
        company shall retain the customary short rate proportion of the premium.
        This policy may be cancelled by the company by mailing to the named     
        insured at the address shown in this policy written notice stating when,
        not less than thirty (30) days thereafter, such cancellation shall be
        effective, except this policy may be cancelled as aforesaid by not less
        than ten (10) days notice when the cancellation is being effected by
        reason of the named insured's nonpayment of premium.

        The mailing of notice as aforesaid shall be sufficient notice and the
        effective date of cancellation stated in the notice shall become the end
        of the policy period.  If the company cancels, earned premium shall be
        computed pro rata.  Delivery of such written notice either by the named
        insured or by the company shall be equivalent to mailing.

        Premium adjustment shall be made by the company either at the time
        cancellation is effected or as soon as practicable thereafter.  The
        check of the company or its representative, mailed or delivered, shall
        be sufficient tender of any refund due the named insured.

        If this policy insures more than one named insured, cancellations may
        be effected by the first such named insureds for the account of
        insureds; and notice of cancellation by the company to such first named
        insured shall be notice to all insureds.  Payment of any unearned
        premium to such first named insured shall be for the account of all
        interests therein.

K.      OTHER INSURANCE  If other valid and collective insurance is available to
        the insured which covers a loss also covered by this policy, other than
        insurance that is specifically purchased as being in excess of this
        policy, this policy shall operate in excess of, and not contribute with,
        such other insurance.

L.      CHANGES IN UNDERLYING INSURANCE  Any changes in coverage or the insurer
        in the underlying insurance shall be promptly reported to the company
        and the insured shall, upon request, furnish the company with copies of
        such changes.  Any change in premium in the underlying insurance shall
        be promptly reported tot he company and the premium for this policy may
        be adjusted in accordance with the manuals of the company then in
        effect.


IN WITNESS WHEREOF, the company has caused this policy to be signed by its
president and secretary but this policy shall not be valid unless completed by
the attachment hereto of a Declaration page countersigned by a duly authorized
representative of the company.





               Secretary                               President
   115
                           NUCLEAR ENERGY LIABILITY
                             EXCLUSION ENDORSEMENT


It is agreed that:
I. This policy does not apply:
    (a) under any liability coverage, to injury, sickness, disease,
    death, destruction or loss 
    1.  with respect to which an insured under the policy is also an insured 
        under a nuclear energy liability policy issued by Nuclear Energy
        Liability Insurance Association, Mutual Atomic Energy Liability
        Underwriters or Nuclear Insurance Association of Canada, or  would be
        an insured under any such policy but for its termination upon
        exhaustion of its limit of liability; or 
    2.  resulting from the hazardous properties or nuclear material and with 
        respect to which (a) any person or organization is required to 
        maintain financial protection pursuant to the Atomic Energy Act of
        1954, or any law amendatory thereof, or (b) the insured is, or had its
        policy not been issued would be, entitled to indemnity from the United
        States of America, or any agency thereof, under any agreement entered
        into by the United States of America, or any agency thereof, with any 
        person or organization; 

    (b) under any liability coverage, to injury, sickness, disease, death, 
        destruction or loss resulting from the hazardous properties of 
        nuclear material, if 
    1.  the nuclear material (a) is at any nuclear facility owned by, or 
        operated by or on behalf of, an insured or (b) has been
        discharged or dispersed therefrom; 
    2.  the nuclear material is contained in spent fuel or waste at any time 
        possessed, handled, used, processed, stored, transported or 
        disposed of by or on behalf of an insured; or 
    3.  the injury, sickness, disease, death, destruction or loss arises out of
        the furnishing by an insured of services, materials, parts or
        equipment in connection with the planning, construction, maintenance, 
        operation or use of any nuclear facility, but if such facility is
        located within the United States of America, its territories or 
        possessions or Canada, this exclusion (3) applies only to injury to or
        destruction of or loss of property at such nuclear facility; 
 
II. As used in this endorsement: 
    "hazardous properties" include radioactive, toxic or explosive properties; 
    "nuclear material" means source material, special nuclear material or    
    byproduct material: 
    "source material", "special nuclear material", and "byproduct material" 
    have the meanings given them in the Atomic Energy Act of 1954 or in any 
    law amendatory thereof. 
 
    "spent fuel" means any fuel element or fuel component, solid or liquid,
    which has been used or exposed to radiation in a nuclear reactor; 
 
    "waste" means any waste material (1) containing byproduct material and (2)
    resulting from the operation by any person or organization of any
    nuclear facility included within the definition of nuclear facility under
    paragraph (1) or (2) thereof; 
 
    "nuclear facility" means 
 
    1.  any nuclear reactor: 
    2.  any equipment or device designed or used for (a) separating the 
        isotopes of uranium or plutonium, (b) processing or
        utilizing spent fuel, or (c) handling, processing or packaging waste: 
    3.  any equipment or devise used for processing, fabricating or alloying of 
        special nuclear material if at any time the total amount of such
        material in the custody of the insured at the premises where such 
        equipment or devise is located consists of or contains more than 25
        grams of plutonium or uranium 223 or any combination thereof, or more
        than 250 grams of uranium 235; 

   4.   any structure, basin, excavation, premises or place prepared or used for
        the storage or disposal of waste; and includes the site on which any 
        of the foregoing is located, all operations conducted on such
        site and all premises used for such operations; 
 
    "nuclear reactor" means any apparatus designed or used to sustain nuclear
    fission in self-supporting chain reaction or to contain a critical mass
    of fissionable material; 
 
    With respect to injury to or destruction of or loss of property, the word
    "injury" or "destruction" or "loss" includes all forms of radioactive
    contamination of property; 
 
    All other terms and conditions of this policy remain unchanged. 
   116
IMPORTANT NOTE:  THIS IS CLAIMS MADE COVERAGE.  PLEASE READ THIS POLICY
CAREFULLY.

THIS POLICY, SUBJECT TO THE DECLARATIONS, INSURING AGREEMENTS, TERMS,
CONDITIONS, LIMITATIONS AND AMENDMENTS, APPLIES ONLY TO CLAIM OR CLAIMS THAT    
ARE FIRST MADE AGAINST THE INSURED(S) AND REPORTED TO THE INSURER DURING THE
POLICY PERIOD OR DISCOVERY PERIOD (IF APPLICABLE)

THE LIMIT OF LIABILITY AVAILABLE TO PAY JUDGMENTS OR SETTLEMENTS SHALL BE
REDUCED AND MAY BE EXHAUSTED BY AMOUNTS INCURRED FOR DEFENSE COSTS, CHARGES AND
EXPENSES.  THE RETENTION(S) APPLY(IES) TO DEFENSE COSTS.  CHARGES AND EXPENSES.

                                              ST. PAUL MERCURY INSURANCE COMPANY
EXCESS DIRECTORS AND OFFICERS LIABILITY AN CORPORATE INDEMNIFICATION POLICY
                                  DECLARATIONS


Item 1. Named Insured:    The Directors and Officers of
        BOLT BERANEK AND NEWMAN, INC. AND ITS SUBSIDIARIES

Item 2. Address (No., Street, City, State and Zip Code)
        150 Cambridge Park Drive
        Cambridge, MA  02140

Item 3. Policy Period
        From       To
        12-01-94   12-01-95   (12:01 A.M. Standard Time at the address stated
                   in Item 2.)

Item 4. Limit of Liability  $ 5,000,000  each Policy Period in excess of Item
        7(E).  The limit of liability available to pay judgments or settlements
        shall be reduced and may be exhausted by amounts incurred for legal
        defense costs, charges and expense.

Item 5. Retentions  (Applicable to Section 2(B)(2))
        $  1,000,000 Corporate Indemnification Each Loss
        $   -0-      Each Insured Each Loss
        $   -0-      Aggregate All Insureds Each Loss

Item 6. Premium $  149,010

Item 7. Schedule of Underlying Insurer(s)
        (A)1.  Underlying Insurer:  Federal Insurance Company
           2.  Policy Number:  8137-71-31-A
           3.  Policy Period:   From:  12-01-94     To:   12-01-95
           4.  Limit of Liability:  $ 3,000,000
           5.  Retentions:
               $  1,000,000Corporate Indemnification Each Loss
               $   -0-    Each Insured Each Loss
               $   -0-    Aggregate All Insureds Each Loss
        (B)1.  Underlying Insurer:  Not Applicable
   117
           2.  Policy Number:
           3.  Policy Period:   From:      To:
           4.  Limit of Liability:  $
        (C)1.  Underlying Insurer:  Not Applicable
           2.  Policy Number:
           3.  Policy Period:   From:      To:
           4.  Limit of Liability:  $
        (D)1.  Underlying Insurer:  Not Applicable
           2.  Policy Number:
           3.  Policy Period:   From:      To:
           4.  Limit of Liability:  $
        (E)Total amount of Underlying Limit of Liability $ 3,000,000 and any
        retentions or deductibles as applicable under the policy(ies) as stated
        in this Item 7.

Item 8. Subject to the Terms, Conditions and Limitations of this policy as
        hereinafter provided, this policy follows the form of:
        Insurer's Name:  Federal Insurance Company
        Policy Number:  8137-71-31-A

Item 9. Forms Attached
        1) St. Paul Mercury Insurance Company Policy, Form #50408.
        2) Endorsement one.
        3) St. Paul Mercury Insurance Renewal Application, Form #50264, and its
        attachments.
   118
                                INSURING CLAUSE

In consideration of the payment of the premium, in reliance upon the statements
made to the Insurer by application including its attachments, a copy of which
is attached to and forms a part of this policy, and any material submitted
herewith (which shall be retained on file by the Insurer and be deemed attached
hereto), and except as hereinafter otherwise provided or amended, this
policy is subject to the same Insuring Agreement(s), Terms, Conditions and
Limitations as provided by the policy stated in Item 8 of the Declarations and
any amendments thereto, provided:

A.   1.  the Insurer has received prior written notice from the
         Insured(s) of any amendments to the policy stated in Item 8 of the
         Declarations, and
     2.  the Insurer has given to the Insured(s) its written consent to any 
         amendments to the policy stated in Item 8 of the Declarations, and
     3.  the Insured has paid any additional premium.

B.   This policy is not subject to the same premium or the amount and Limit of
     Liability of the policy stated in Item 8 of the Declarations.


                       TERMS, CONDITIONS AND LIMITATIONS

Section 1.  UNDERLYING INSURANCE

A.   It is a condition precedent to the Insured(s) rights under this policy
     that the Insured(s) notify the Insurer, as soon as practical in writing,
     of a failure to maintain in full force and effect, except as provided for
     under Section 2(B), an without alteration of any Terms, Conditions,
     Limit of Liability or Retentions, any of the underlying insurance policies
     as stated in Item 7 of the Declarations.

B.   Failure to maintain, as set forth above, any of the underlying insurance
     policies as stated in Item 7 of the Declarations, except as provided for
     under Section 2(B), shall not invalidate this policy, but the liability of
     the Insurer for loss under this policy shall apply only to the same extent
     it would have been liable had the underlying insurance policies been
     maintained as set forth above.  In no event shall the Insurer be liable to
     pay loss under this policy until the total amount of the Underlying Limit
     of Liability, as stated in Item 7(E) of the Declarations, has been paid
     solely by reason of the payment of loss.

Section 2.     LIMIT OF LIABILITY

A.   The Insurer shall only be liable to make payment under this policy after
     the total amount of the Underlying Limit of Liability as stated in Item
     7(E) of the Declarations has been paid solely by reason of the payment of
     loss.
   119

B.   In the event of the reduction or exhaustion of the total amount of the
     Underlying Limit of Liability as stated in Item 7(E) of the Declarations
     solely by reason of the payment of loss, this policy shall:
     1.   in the event of such reduction pay excess of the reduced amount
          of the Underlying Limit of Liability but not to exceed the amount
          stated in Item 4 of the Declarations, or
     2.   in the event of exhaustion continue in force provided always that
          this policy shall only pay the excess over the Retention amount stated
          in Item 5 of the Declarations as respects each and every loss
          hereunder, bot not to exceed the amount stated in Item 4 of the
          Declarations.

C.   The Insurer's liability for loss subject to paragraphs (A) and (B) above
     shall be the amount stated in Item 4 of the Declarations which shall be the
     maximum liability of the Insurer in the Policy Period stated in Item 3 of
     the Declarations.  The Limit of Liability of the Insurer for the Discovery
     Period, if elected, shall be part of, and not in addition to, the Limit of
     Liability as stated in Item 4 of the Declarations.

Section 3.     LOSS PROVISIONS

The Insured(s) shall as a condition precedent to the right to be indemnified
under this policy give to the Insurer notice in writing, as soon as practicable
and during the Policy Period or during the Discovery Period, if effective, or
any claim made against the Insured(s).

Section 4.     NOTICE

Notice hereunder shall be given to St. Paul Mercury Insurance Company, 385
Washington Street, St. Paul, MN  55102.

Section 5.     CANCELLATION

This policy may be cancelled by the Corporation at any time by mailing written
notice to the Insurer at the address shown in Section 4 stating when thereafter
such cancellations shall be effective or by surrender of this policy to the
Insurer or its authorized agent.  This policy may also be cancelled by or on
behalf of the Insurer by delivering to the Corporation or by mailing to the
Corporation by registered, certified, or other first class mail, at the
Corporation's address as shown in Item 2 of the Declarations, written notice    
stating when, not less than sixty (60) days thereafter, the cancellation shall
be effective.  The mailing of such notice as aforesaid shall be sufficient
proof of notice.  The Policy Period terminates at the date and hour specified
in such notice, or at the date and time of surrender.

If the period of limitation relating to the giving of notice is prohibited or
made void by any law controlling the construction thereof, such period shall be
deemed to be amended so as to be equal to the minimum period of limitation
permitted by such law.
   120

Section 6.     DISCOVERY PERIOD

If the Insurer shall cancel or refuse to renew (refuse to renew is hereafter
referred to as non-renewal) this policy, the Corporation or the Insureds shall
have the right, upon payment of the additional premium of 75% of the premium
hereunder, to an extension of the cover granted by this policy to report any
claim or claims in accordance with Section 3, which claim or claims are made
against the Insureds during the period of twelve (12) months after the
effective date of cancellation or non-renewal, herein called Discovery Period,
but only for any Wrongful Act committed before the effective date of such
cancellation or non-renewal and otherwise covered by this policy.

This right shall terminate, however, unless the Corporation or the Insureds
provide written note of such election together with the payment or the
additional premium due and this is received by the Insurer at the address shown
in Section 4 within then (10) days after the effective date of cancellation or
non-renewal.

Discovery Period wherever used in this policy shall also mean optional
extension period or extended reporting period as defined by the policy stated
in Item 8 of the Declarations.

The offer by the Insurer of renewal terms, conditions, limits of liability
and/or premiums different from those of the expiring policy shall not   
constitute non-renewal.

The provisions of this Section 6 an the rights granted herein to the
Corporation or the Insureds shall not apply to any cancellation resulting from
non-payment or premium.

Section 7.     NUCLEAR ENERGY LIABILITY EXCLUSION

It is agreed that:

A. This policy does not apply:
   1.   Under any Liability Coverage, to bodily injury or property damage
        a.   with respect to which an Insured under this policy is also
             an Insured under a nuclear energy liability policy issued by
             Nuclear Energy Liability Insurance Association, Mutual Atomic
             Energy Liability Underwriters or Nuclear Insurance Association of
             Canada, or would be an Insured under any such policy but for its
             termination upon exhaustion of its limit of liability; or
        b.   resulting from the hazardous properties of nuclear material
             and with respect to which (1) any person or organization is
             required to maintain financial protection pursuant to the Atomic
             Energy Act of 1954, or any law amendatory thereof, or (2) the
             Insured is, or had this policy not been issued would be, entitled
             to indemnity from the United States of America, or an agency
             thereof, under any agreement entered into by the United States 

   121
            of America, or any agency thereof with any person or
            organization.

   2.   Under any Medical Payments coverage, or under any Supplementary 
        Payments provision relating to first aid, to expenses incurred with
        respects to bodily injury resulting from hazardous properties of
        nuclear material and arising out of the operation of a nuclear facility
        by any person or organization.

   3.   Under any Liability Coverage, to bodily injury or property damage 
        resulting from the hazardous properties of nuclear material, if
        a.  the nuclear material (1) is at any nuclear facility owned by,
            or operated by or on behalf of an Insured or (2) has been
            discharged or dispersed therefrom;
        b.  the nuclear material is contained in spent fuel or waste at
            any time possessed, handled, used, processed, stored, transported
            or disposed of by or on behalf of an Insured, or
        c.  the bodily injury or property damage arises out of the
            furnishing by an Insured of services, materials, parts or
            equipment in connection with the planning, construction,
            maintenance, operation or use of any nuclear facility, but if
            such facility is located within the United States of America, its
            territories or possessions or Canada, this exclusion (c) applies
            only to property damage to such nuclear facility and any property
            thereat.

B.   As used in this exclusion:

     "hazardous properties" includes radioactive, toxic or explosive properties;

     "nuclear material" means source material. special nuclear material or by-
     product material.

     "source material," "special nuclear material," and by-product material have
     the meanings given them in the Atomic Energy Act of 1954 or in any law
     amendatory thereof;

     "spent fuel" means any fuel element or fuel component, solid or liquid,
     which has been used or exposed to radiation in a nuclear reactor;
        
     "waste" means any waste material (1) containing by-product material and
     (2) resulting from the operation by any person or organization of any
     nuclear facility included within the definition of nuclear facility
     under paragraph (1) or (2) thereof;

     "nuclear facility" means
     (1) any nuclear reactor,
   122
     (2)  any equipment or device designed or used for (1) separating the
     isotopes of uranium or plutonium, (2) processing or utilizing spent fuel,
     or (3) handling, processing or packaging waste,

     (3)  any equipment or device used for the processing, fabricating or
     alloying of special nuclear material if at any time the total amount of
     such material in the custody of the Insured and the premises where
     such equipment or device is located consists of or contains more than 25
     grams of plutonium or uranium 223 or any combination thereof, or more than
     250 grams or uranium 235,

     (4)  any structure, basin, excavation, premises or place prepared or used
     for the storage or disposal of waste, and includes the site on which any
     of the foregoing is located, and operations conducted on such site and all
     premises used for such operations;

     "nuclear reactor" means any apparatus designed or used to sustain nuclear
     fission in a self-supporting chain reaction or to contain critical mass of
     fissionable material, "property damage" includes all forms of radioactive
     contamination of property.

Section 8.     ACTION AGAINST THE INSURER

No action shall lie against the Insurer unless, as a condition precedent
thereto, there shall have been full compliance with all of the terms of this
policy, nor until the amount of the Corporation's obligation to pay and /or the
Insureds' obligation to pay have been finally determined either by judgment
against the Insureds after actual trial or by written agreement of the
Corporation and/or the Insureds, the claimant and the Insurer.

Any person or organization or the legal representative thereof who has secured
such judgment or written agreement shall thereafter be entitled to recover
under this policy to the extent of the insurance afforded by this policy.  No
person or organization shall have any right under this policy to join the
Insurer as a party to any action against the Corporation and/or Insureds to
determine the Insured's liability, nor shall the Insurer be impleaded by the
Corporation and/or Insureds or their legal representatives.  Bankruptcy or
insolvency of the Corporation or the Corporation's estate, or bankruptcy or
insolvency of the Insureds or the Insureds' estate shall not relieve the
Insurer of any of its obligations hereunder.

IN WITNESS WHEREOF, the Insurer designated on the Declarations page has caused
this policy to be signed by its President and Secretary and countersigned on    
the Declaration page by a duly authorized representative of the Insurer.



                    Secretary                     President
   123

                                ENDORSEMENT  #1

The following spaced preceded by an asterisk (*) need not be completed if this
endorsement and the policy have the same inception date.



   ATTACHED TO AND     * EFFECTIVE DATE OF      * ISSUED TO
FORMING PART OF POLICY     ENDORSEMENT
         NO.
                        
      900DX0103


                     PRIOR AN PENDING LITIGATION EXCLUSION
                                 M1150 Ed. 3-90


In consideration of the premium charged, it is hereby understood and agreed that
the Insurer shall not be liable to make any payment for loss in connection with
any claim or claims made against the Insured(s) arising from any prior or
pending litigation as of 12-31-92, as well as all future claims or litigation
based upon the pending or prior litigation or derived from the same or
essentially the same facts (actual or alleged) that gave rise to the prior or
pending litigation.





Nothing herein contained shall be held to vary, alter, waive or extend any of
the terms, conditions, provisions, agreements or limitations of the above
mentioned policy, other than as above stated.


*Agency Name and Address                In Witness Whereof, the Company
                                        has caused this endorsement to be
                                        signed by a duly authorized
                                        representative of the Company