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.


                                       1



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.


                                       5



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.


                                       6



                                    EXHIBIT A



PERSONS COVERED BY THIS CODE OF ETHICS


                                                                                 
- ------------------------------------- ------------------------- ------------------------- --------------------------
                                             PRINCIPAL                 PRINCIPAL            PRINCIPAL ACCOUNTING
                                             EXECUTIVE                 FINANCIAL                   OFFICER
FUND                                          OFFICER                   OFFICER
- ------------------------------------- ------------------------- ------------------------- --------------------------
Total Return                              R. Alan Medaugh            Stacey E. Hong            Stacey E. Hong
- ------------------------------------- ------------------------- ------------------------- --------------------------
Managed Municipal                         R. Alan Medaugh            Stacey E. Hong            Stacey E. Hong
- ------------------------------------- ------------------------- ------------------------- --------------------------
North American                            R. Alan Medaugh            Stacey E. Hong            Stacey E. Hong
- ------------------------------------- ------------------------- ------------------------- --------------------------
Strategy                                  R. Alan Medaugh            Stacey E. Hong            Stacey E. Hong
- ------------------------------------- ------------------------- ------------------------- --------------------------


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.


                                      -A1-