TOTAL RETURN U.S. TREASURY FUND, INC.
                          MANAGED MUNICIPAL FUND, INC.
                    NORTH AMERICAN GOVERNMENT BOND FUND, INC.
                             ISI STRATEGY FUND, INC.

                     CODE OF ETHICS PURSUANT TO SECTION 406
                        OF THE SARBANES-OXLEY ACT OF 2002


I. COVERED OFFICERS/PURPOSE OF THE CODE

     This Code of Ethics ("Code") has been adopted by TOTAL RETURN U.S. TREASURY
FUND, INC. ("TOTAL RETURN"), MANAGED MUNICIPAL FUND, INC. ("MANAGED MUNICIPAL"),
NORTH AMERICAN  GOVERNMENT BOND FUND, INC.  ("NORTH  AMERICAN") and ISI STRATEGY
FUND, INC. ("Strategy") (each a "FUND" and, together,  the "ISI FUNDS") pursuant
to Section 406 of the Sarbanes-Oxley Act of 2002 (the "ACT").  This Code applies
to each Fund's Principal  Executive  Officer,  Principal  Financial  Officer and
Principal  Accounting  Officer (or others  serving in a similar  capacity)  (the
"COVERED  OFFICERS," as identified in EXHIBIT A). This Code has been adopted for
the purpose of promoting:

     o    honest and ethical  conduct,  including the ethical handling of actual
          or apparent  conflicts of interest  between  personal and professional
          relationships;

     o    full, fair, accurate,  timely and understandable disclosure in reports
          and documents  that a Fund files with,  or submits to, the  Securities
          and Exchange  Commission  ("SEC") and in other  public  communications
          made by the Fund;

     o    compliance   with   applicable   laws  and   governmental   rules  and
          regulations;

     o    the  prompt  internal  reporting  of  violations  of  the  Code  to an
          appropriate person or persons identified in the Code; and

     o    accountability for adherence to the Code.

     Each Covered  Officer  should adhere to a high standard of business  ethics
and  should  be  sensitive  to  situations  that may give rise to  conflicts  of
interest.

II. COVERED OFFICERS SHOULD HANDLE  ETHICALLY  ACTUAL AND APPARENT  CONFLICTS OF
INTEREST

     OVERVIEW.  A "conflict of interest" occurs when a Covered Officer's private
interest interferes with the interests of, or his or her service to, a Fund. For
example, a conflict of interest would arise if a Covered Officer, or a member of
the Covered Officer's family, receives improper personal benefits as a result of
the Covered Officer's position with the Fund.




     Certain  conflicts  of  interest  arise  out of the  relationships  between
Covered  Officers  and the Fund and  already are subject to conflict of interest
provisions in the  Investment  Company Act of 1940  (including  the  regulations
thereunder,  the "1940 ACT") and the Investment  Advisers Act of 1940 (including
the regulations thereunder, the "INVESTMENT ADVISERS ACT"). For example, Covered
Officers may not engage in certain transactions (such as the purchase or sale of
portfolio securities or other property) with the Fund because of their status as
"affiliated persons" of the Fund. The compliance programs and procedures of each
Fund and its investment advisor and any sub-advisor (the "ADVISOR") are designed
to prevent, or identify and correct,  violations of these provisions.  This Code
does  not,  and is not  intended  to,  repeat  or  replace  these  programs  and
procedures,  and such conflicts fall outside of the parameters of this Code. SEE
ALSO Section V of this Code.

     Although  typically not  presenting an  opportunity  for improper  personal
benefit,  conflicts  may  arise  from,  or  as  a  result  of,  the  contractual
relationship between the Funds and the Advisor or a Fund's administrator or fund
accounting agent ("OTHER SERVICE PROVIDERS"),  of which the Covered Officers are
also officers or employees.  As a result,  this Code recognizes that the Covered
Officers will, in the normal course of their duties (whether for the Fund or for
the  Advisor or other  service  providers,  or for any of them),  be involved in
establishing  policies  and  implementing  decisions  that will  have  different
effects  on  the  Advisor  and  other  service   providers  and  the  Fund.  The
participation  of the  Covered  Officers in such  activities  is inherent in the
contractual  relationships  between  the Fund  and the  Advisor  and such  other
service providers and is consistent with the performance by the Covered Officers
of their duties as officers of the Fund.  Thus, if performed in conformity  with
the provisions of the 1940 Act and the Investment  Advisers Act, such activities
will be deemed to have been handled ethically.  In addition, the Funds' Board of
Directors  ("BOARD") recognize that the Covered Officers may also be officers or
employees  of one or more other  investment  companies  covered by this or other
codes and that such  service,  by itself,  does not give rise to a  conflict  of
interest.

     Other conflicts of interest are covered by the Code, even if such conflicts
of interest are not the subject of provisions of the 1940 Act and the Investment
Advisers  Act. The  following  list  provides  examples of conflicts of interest
under the Code, but Covered Officers should keep in mind that these examples are
not  exhaustive.  The overarching  principle is that the personal  interest of a
Covered Officer should not be placed improperly before the interest of the Fund.

          *                *                 *                 *

     With respect to each Fund, each Covered Officer must not:

     o    use his or her personal influence or personal relationships improperly
          to influence  investment  decisions or financial reporting by the Fund
          whereby the Covered Officer would benefit  personally to the detriment
          of the Fund;

     o    cause  the  Fund to take  action,  or  fail  to take  action,  for the
          individual  personal  benefit of the Covered  Officer  rather than the
          benefit of the Fund; or

                                      -2-


     o    retaliate  against any other  Covered  Officer or any  employee of the
          Funds or their service  providers for reports of potential  violations
          that are made in good faith.

     There are some  conflict  of  interest  situations  that  should  always be
approved by the  President of the Fund (or,  with respect to  activities  of the
President,  by the chairman of the Fund's audit  committee).  These  conflict of
interest situations are listed below:

     o    service on the board of  directors  or  governing  board of a publicly
          traded entity;

     o    the receipt of any non-nominal gifts from persons or entities who have
          or are seeking business relationships with any Fund;

     o    the receipt of any entertainment  from any company with which the Fund
          has current or prospective business dealings unless such entertainment
          is  business-related,  reasonable in cost,  appropriate as to time and
          place, and not so frequent as to raise any question of impropriety;

     o    any   ownership   interest  in,  or  any   consulting   or  employment
          relationship  with, any entities  doing business with the Fund,  other
          than the  Advisor  or another  service  provider  or their  respective
          affiliates.  [This  restriction  shall not apply to or otherwise limit
          the  ownership of publicly  traded  securities  so long as the Covered
          Person's  ownership  does not exceed  more than 2% of the  outstanding
          securities of the relevant class.]

     o    a direct or indirect  financial  interest in commissions,  transaction
          charges  or  spreads  paid  by  the  Fund  for   effecting   portfolio
          transactions or for selling or redeeming shares other than an interest
          arising from the Covered  Officer's  employment with the Advisor,  the
          Fund's  principal  underwriter or their respective  affiliates.  [This
          restriction shall not apply to or otherwise limit (i) the ownership of
          publicly traded  securities so long as the Covered Person's  ownership
          does not  exceed  more  than 2% of the  particular  class of  security
          outstanding  or (ii) the  receipt by the  Advisor or an  affiliate  of
          research or other benefits in exchange for "soft dollars."]

III. DISCLOSURE AND COMPLIANCE

     o    Each Covered  Officer should  familiarize  himself or herself with the
          disclosure requirements generally applicable to the Fund;

     o    each  Covered  Officer  should not  knowingly  misrepresent,  or cause
          others to misrepresent, facts about the Fund to others, whether within
          or outside the Fund,  including to the Fund's Board and auditors,  and
          to governmental regulators and self-regulatory organizations;

                                      -3-


     o    each Covered Officer should, to the extent  appropriate  within his or
          her area of responsibility,  consult with other officers and employees
          of the  Funds  and the  Advisor  and,  as  applicable,  other  service
          providers with the goal of promoting full, fair, accurate,  timely and
          understandable  disclosure in the reports and documents the Funds file
          with, or submit to, the SEC and in other public communications made by
          the Funds; and

     o    it is the responsibility of each Covered Officer to promote compliance
          with the standards and restrictions  imposed by applicable laws, rules
          and regulations.

IV. REPORTING AND ACCOUNTABILITY

     With respect to each Fund, each Covered Officer must:

     o    upon adoption of this Code (or thereafter as applicable, upon becoming
          a Covered  Officer),  affirm in writing to the Fund that he or she has
          received, read and understands the Code;

     o    annually  thereafter  affirm to the Fund  that he or she has  complied
          with the requirements of the Code;

     o    provide full and fair  responses to all questions  asked in the Fund's
          periodic Director and Officer Questionnaire as well as with respect to
          any supplemental request for information; and

     o    notify the  President  of the Fund  promptly if he or she knows of any
          violation of this Code (with respect to violations by a President, the
          Covered  Officer  shall report to the chairman of the Fund's Audit and
          Compliance Committee (the "COMMITTEE")).  Failure to do so is itself a
          violation of this Code.

     The President of the Fund is responsible for applying this Code to specific
situations in which  questions  are presented  under it and has the authority to
interpret  this Code in any  particular  situation.  However,  any  approvals or
waivers sought by the President will be considered by the Committee.

     The Funds will follow these procedures in investigating  and enforcing this
Code (in the case of a suspected  violation of this Code by the  President,  the
actions  specified  below to be  taken  by the  President  will  instead  be the
responsibility of the chairman of the Committee):

     o    the President  will take all  appropriate  action to  investigate  any
          potential  violations  reported  to him,  which may include the use of
          internal or external counsel, accountants or other personnel;

                                      -4-


     o    if, after such investigation, the President believes that no violation
          has  occurred,  the  President  is not  required  to take any  further
          action;

     o    any matter that the President believes is a violation will be reported
          to the Committee;

     o    if the Committee concurs that a violation has occurred, it will inform
          and  make  a  recommendation   to  the  Board,   which  will  consider
          appropriate  action,  which may  include  review of,  and  appropriate
          modifications to, applicable policies and procedures;  notification to
          appropriate personnel of the Advisor or its board; or a recommendation
          to dismiss the Covered Officer;

     o    the  Committee  will be  authorized  to  grant  waivers,  as it  deems
          appropriate; and

     o    any changes to or waivers of this Code will,  to the extent  required,
          be disclosed as provided by SEC rules.

V. OTHER POLICIES AND PROCEDURES

     This Code  shall be the sole code of  ethics  adopted  by the ISI Funds for
purposes  of  Section  406 of the  Sarbanes-Oxley  Act and the  rules  and forms
applicable  to  registered  investment  companies  thereunder.  Insofar as other
policies  or  procedures  of the ISI  Funds  or the  Advisor  or  other  service
providers  govern or purport to govern the behavior or activities of the Covered
Officers who are subject to this Code,  they are  superseded by this Code to the
extent that they conflict with the  provisions of this Code.  The ISI Funds' and
their  Advisors' and service  providers'  codes of ethics under Rule 17j-1 under
the 1940 Act and the  Advisors'  and  other  service  providers'  more  detailed
compliance  policies and  procedures are separate  requirements  applying to the
Covered Officers and others, and are not part of this Code.

VI. AMENDMENTS

     Any  amendments to this Code,  other than  amendments to EXHIBIT A, must be
approved or ratified  by a majority  vote of the Board,  including a majority of
independent directors.

VII. CONFIDENTIALITY

     All reports and records  prepared or maintained  pursuant to this Code will
be considered  confidential  and shall be maintained and protected  accordingly.
Except as  otherwise  required by law or this Code,  such  matters  shall not be
disclosed to anyone except as authorized by the Board.



VIII. INTERNAL USE

     The Code is intended  solely for the internal use by the Funds and does not
constitute  an  admission,  by or on  behalf  of  any  Fund,  as  to  any  fact,
circumstance or legal conclusion.


Date:  _______________________


                                      -5-



                                    EXHIBIT A



PERSONS COVERED BY THIS CODE OF ETHICS


                                                                                           
- --------------------------------------------------------------------------------------------------------------------
                                             PRINCIPAL                 PRINCIPAL            PRINCIPAL ACCOUNTING
                                             EXECUTIVE                 FINANCIAL                   OFFICER
FUND                                          OFFICER                   OFFICER
- --------------------------------------------------------------------------------------------------------------------

Total Return                              R. Alan Medaugh         Stephen V. Killorin        Stephen V. Killorin
- --------------------------------------------------------------------------------------------------------------------

Managed Municipal                         R. Alan Medaugh         Stephen V. Killorin        Stephen V. Killorin
- --------------------------------------------------------------------------------------------------------------------

North American                            R. Alan Medaugh         Stephen V. Killorin        Stephen V. Killorin
- --------------------------------------------------------------------------------------------------------------------

Strategy                                  R. Alan Medaugh         Stephen V. Killorin        Stephen V. Killorin
- --------------------------------------------------------------------------------------------------------------------


Note that a listed officer is only a "Covered  Officer" of the Fund(s) for which
he or she serves as a Principal  Executive Officer,  Principal Financial Officer
or Principal Accounting Officer.

                                     -A-1-