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.


                                      -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.


Date:  January 1, 2008


                                      -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      Mark J. Seger       Mark J. Seger
- --------------------------------------------------------------------------------
Managed Municipal      R. Alan Medaugh      Mark J. Seger       Mark J. Seger
- --------------------------------------------------------------------------------
North American         R. Alan Medaugh      Mark J. Seger       Mark J. Seger
- --------------------------------------------------------------------------------
Strategy               R. Alan Medaugh      Mark J. Seger       Mark J. Seger
- --------------------------------------------------------------------------------

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-