---------------------------
                                     Q & A
                           1999 SHAREHOLDER PROXIES
                                      FOR
                            USAA MUTUAL FUND, INC.,
                          USAA TAX EXEMPT FUND, INC.,
                          USAA INVESTMENT TRUST, AND
                           USAA STATE TAX-FREE TRUST
                          ---------------------------

There will be a shareholder  meeting on October 15, 1999  affecting all 38 USAA
mutual funds. The meeting will be held in the McDermott  Auditorium in the USAA
Building at 2:00 p.m.,  CST.  August 19, 1999,  is both the Record Date and the
approximate date on which the proxies will be sent to shareholders.

THE  FOLLOWING  LISTS THE  PROPOSALS ON WHICH  SHAREHOLDERS  ARE BEING ASKED TO
VOTE:

- -------------------------------------------------------------------------------
                         Mutual    Mutual Fund,
                       Fund, Inc.   Inc. (all      Tax                State Tax
                       (Index     funds except    Exempt    Investment   Free
   Proposals:          Fund only)  Index Fund)   Fund, Inc.   Trust      Trust
- -------------------------------------------------------------------------------
Election of Board of
Directors (or Board of
Trustees, as applicable)     X            X          X          X          X
- -------------------------------------------------------------------------------
Selection of KPMG to serve
as independent auditors                   X          X          X          X
- -------------------------------------------------------------------------------
Selection of
PricewaterhouseCoopers to
serve as independent
accountants                  X
- -------------------------------------------------------------------------------
Approval of a new investment
advisory agreement between
the Equity 500 Index
Portfolio (the "Portfolio")  X
and Bankers Trust Company
- -------------------------------------------------------------------------------
Election of trustees of
the Portfolio                X
- -------------------------------------------------------------------------------
Selection of
PricewaterhouesCoopers
to serve as independent
accountants for the          X
Portfolio
- -------------------------------------------------------------------------------

ADP FINANCIAL  INFORMATION  SERVICES,  INC., has been hired to mail the proxies
and tabulate the results.  Shareholders  will return their ballots  directly to
ADP  for  tabulation.  Mailings  to  the  shareholders  will  contain  a  proxy
statement,  proxy card, return envelope and a card briefly setting out the four
ways in which a shareholder can vote.

D.F. KING, a proxy  solicitation  firm, has also been retained,  if needed,  to
assist the funds in obtaining  sufficient votes for a quorum at the shareholder
meeting and will call and encourage  those  shareholders  who have not returned
their proxies to do so.


                            ----------------------
                            IN GENERAL (ALL FUNDS)
                            ----------------------

*    WHY IS IT IMPORTANT FOR ME TO VOTE?

     When you cast your vote,  you are telling us how to vote on your behalf on
     important  issues  relating  to  your  fund(s).  Your  vote  is  extremely
     important  to us  regardless  of how many  shares  you own.  Your  vote is
     important to achieving a quorum for the meeting in order to avoid  further
     costs to your funds for  additional  solicitation.  In addition,  we value
     your feedback in the form of your vote on these proposals.

*    WHAT ARE THE DIFFERENT WAYS I CAN VOTE MY SHARES?

     As a  shareholder,  you may vote in one of four  ways.  FIRST you may cast
     your vote by calling our special toll-free number, 1-800-690-6903. SECOND,
     you may cast  your vote  through  the  Internet  by going to the web site,
     www.proxyvote.com.  THIRD,  you may vote by sending to us a completed  and
     executed  proxy  card  (we  have  enclosed  with  the  proxy  statement  a
     postage-paid  envelope  for your  convenience).  FINALLY,  you may vote in
     person by attending  the  Shareholder  Meeting.  If you do not  anticipate
     attending  the meeting in person,  WE ENCOURAGE YOU TO VOTE BY INTERNET OR
     TELEPHONE TO MINIMIZE THE COSTS OF SOLICITATION.

*    IF I HAVE ALREADY VOTED, CAN I CHANGE MY VOTE?

     If you have  already  voted by mail,  Internet or  telephone,  but wish to
     change  your  vote,  you may do so at any time  before  they are  voted by
     casting a later-dated  vote,  whether by Internet,  telephone,  mail or in
     person  at the  shareholder  meeting.  Even if you  have  voted  by  mail,
     telephone or Internet, you may still wish to attend the meeting.

*    MUST I SIGN ALL THE PROXIES?

     Each shareholder can potentially  receive multiple proxies.  Each of these
     must be signed in order  for your vote to count.  If there is a  signature
     and no direction on how to vote,  your shares will be voted by the company
     in favor of all proposals.  If you vote, but do not sign the card, it will
     be returned to you for signature if time permits. The same rules apply for
     Internet  and  telephone  voting.  You must  vote  each  proxy  using  the
     different control numbers assigned to each one.

*    HOW DO I OBTAIN A REPLACEMENT PROXY?

     We will be glad to mail out another proxy to you, time permitting.

*    WHY DID I RECEIVE SO MANY PROXIES?

     Each family of funds has its own proxy. If you own a fund in more than one
     family,  you received a proxy for each. If you owned more than one fund in
     the same fund family,  then you will have received one proxy statement and
     multiple  proxy cards  (depending  upon how many  different  funds you own
     within that same family of funds).


*    WHY ARE THERE TWO DIFFERENT PROXY STATEMENTS FOR USAA MUTUAL FUND, INC.?

     Because  there are  several  different  proposals  on which the Index Fund
     shareholders  (and not the 12 remaining funds in this particular family of
     funds) are being asked to vote, we decided to divide the USAA Mutual Fund,
     Inc. proxy statement into two separate proxy statements.  For example,  if
     you own shares in the  Aggressive  Growth  Fund and the Index  Fund,  even
     though they are both offered by USAA Mutual Fund,  Inc.,  you will receive
     two separate proxy statements and proxy cards.

*    WHO IS D.F. KING AND WHY DID I GET A CALL FROM THEM?

     D.F. King is a professional proxy solicitation firm. You may have received
     a call from a D.F. King representative.  They are calling in order to
     encourage you to vote.

*    CAN I GET A COPY OF THE FINANCIAL STATEMENTS?

     Yes, we can send to you, at no charge, a copy of one or more mutual fund's
     annual  reports for their most  recent  fiscal  year,  and a copy of their
     semiannual reports for any subsequent semiannual period.

                        ------------------------------
                        ELECTION OF BOARD OF DIRECTORS
                           (OR TRUSTEES) (ALL FUNDS)
                        ------------------------------

*    WHO ARE THE CURRENT MEMBERS OF THE BOARD OF DIRECTORS (OR TRUSTEES)?

     The Board currently consists of Robert Davis,  Mickey Roth, Jack Saunders,
     Barbara Dreeben,  Howard Freeman,  Robert Mason, and Richard Zucker.  Jack
     Saunders and Howard Freeman are both  resigning  their position as members
     of the Board effective December 31, 1999.

*    WHO ARE THE PROPOSED  MEMBERS OF THE BOARD OF DIRECTORS (OR TRUSTEES)?

     You are being asked to vote on the new Board  consisting  of Robert Davis,
     Mickey  Roth,  David  Peebles,  Barbara  Dreeben,  Robert  Mason,  Michael
     Reimherr, and Richard Zucker. The new members to the Board are proposed to
     be David Peebles and Michael Reimherr, effective January 1, 2000.



                        ------------------------------
                         SELECTION OF KPMG TO SERVE AS
                             INDEPENDENT AUDITORS
                          (ALL FUNDS EXCEPT THE INDEX
                        ------------------------------

*    WHY NOW IS MANAGEMENT ASKING SHAREHOLDERS TO APPROVE THE BOARD'S SELECTION
     OF KPMG (OR  PRICEWATERHOUSECOOPERS FOR THE INDEX FUND) AS THE AUDITORS OF
     THE FUNDS?

     The rules of the SEC which apply to proxy statements require that whenever
     a fund requests its  shareholders to elect the fund's  directors,  it must
     also request that the shareholders approve the independent accounting firm
     which the Board has chosen to audit the funds' books.

                         -----------------------------
                                 SELECTION OF
                           PRICEWATERHOUSECOOPERS TO
                             SERVE AS INDEPENDENT
                         ACCOUNTANTS (INDEX FUND ONLY)
                         -----------------------------

*    WHY DO WE HAVE DIFFERENT ACCOUNTANTS FOR THE INDEX FUND
     (PRICEWATERHOUSECOOPERS) THAN FOR ALL 37 OF THE OTHER FUNDS (KPMG)?

     PricewaterhouseCoopers   was  selected  primarily  on  the  basis  of  its
     expertise as auditors of  investment  companies,  the quality of its audit
     services,  and the competitiveness of the fees charged for these services.
     PricewaterhouseCoopers  also was selected because it serves as independent
     accountants  to the  Equity 500 Index  Portfolio  (the  "Portfolio"),  the
     mutual fund into which the Index Fund invests its  investable  assets.  By
     retaining  PricewaterhouseCoopers  to audit the Index Fund, the Index Fund
     reaps the benefit of cost efficiencies resulting from the Index Fund using
     the same auditors as the Portfolio. Also, as set forth below, shareholders
     of the  Index  Fund are also  being  asked to  approve  the  selection  of
     PricewaterhouseCoopers   to  serve  as  independent   accountants  to  the
     Portfolio.


               ------------------------------------------------------
               EQUITY INDEX PORTFOLIO MATTERS (INDEX FUND ONLY):

               * APPROVAL OF A NEW INVESTMENT ADVISORY AGREEMENT
                 BETWEEN THE EQUITY 500 INDEX PORTFOLIO ("PORTFOLIO")
                 AND BANDKER'S TRUST COMPANY:

               * ELECTION OF TRUSTEES OF THE PORTFOLIO; AND

               * SELECTION OF PRICEWATERHOUSECOOPERS TO SERVE AS
                 INDEPENDENT ACCOUNTANTS FOR THE PORTFOLIO
               ------------------------------------------------------

*    HOW IS THE INDEX FUND DIFFERENT FROM THE OTHER 37 FUNDS IN THE USAA FAMILY
     OF FUNDS?

     The Index  Fund is  different  from any other  fund in the USAA  Family of
     Funds in that it  operates  as a  "feeder  fund" in a  master-feeder  fund
     arrangement  in which the "master fund" is the Equity 500 Index  Portfolio
     (the  "Portfolio").  The  Portfolio is an open-end  management  investment
     company  advised  by Bankers  Trust.  All of the Index  Fund's  assets are
     invested  in the  Portfolio,  which  operates  with  the  same  investment
     objectives  and  policies as the Index Fund.  The Index Fund is one of six
     shareholders in the Portfolio, just as you are one of many shareholders in
     the Index Fund.

*    WHY  AM I, AS A  SHAREHOLDER OF  THE  INDEX FUND, BEING  ASKED TO  VOTE ON
     MATTERS HAVING TO DO WITH THE PORTFOLIO?

     As a shareholder of the  Portfolio,  the Index Fund has been asked to vote
     its shares in the Portfolio on each of the matters identified in Proposals
     III  (a)-(c)  at a meeting of  shareholders  of the  Portfolio  to be held
     October 15, 1999.  Pursuant to the requirements of the 1940 Act applicable
     to master-feeder fund arrangements, the Index Fund must vote its Portfolio
     shares in accordance  with the  directions  received from the Index Fund's
     own  shareholders.  Consequently,  we need  your vote on this  matter  for
     direction as to how the Index Fund should vote its Portfolio shares.

*    HOW WILL THE INDEX FUND VOTE ITS PORTFOLIO SHARES?

     When  you,  as a  shareholder  of the Index  Fund,  cast your vote on this
     matter,  you are  instructing  the  Index  Fund  how it  should  vote  its
     Portfolio  shares.  The  Index  Fund  will  vote its  Portfolio  shares in
     proportion to how all shareholders of the Index Fund vote.  Therefore,  it
     is very  important  that you vote on these matters and tell the Index Fund
     how you would like it to vote.



*    WHAT ARE  THE THREE PORTFOLIO  MATTERS ON WHICH I AM  BEING ASKED TO VOTE?

     FIRST, you are being asked to approve a new investment  advisory agreement
     between  Bankers Trust Company and the  Portfolio.  SECOND,  you are being
     asked to elect the members of the Board of Trustees of the Portfolio  (the
     "Portfolio Board").  FINALLY,  you are being asked to ratify the selection
     of  PricewaterhouseCoopers  LLP as the  independent  accountants  for  the
     Portfolio.

     Keep in mind, however,  that as of May 31, 1999, the Index Fund only owned
     approximately  41% of the  Portfolio.  Therefore,  other  funds  that  are
     shareholders  of the  Portfolio  could  approve  any or all of these three
     proposals, regardless of the Index Fund's vote.

*    WHAT HAS HAPPENED THAT HAS BROUGHT ABOUT THE NEED TO VOTE ON SOME OF THESE
     MATTERS?

     On June 4,  1999,  Bankers  Trust  Company  ("Bankers  Trust")  became  an
     indirect wholly owned subsidiary of Deutsche Bank, A.G. ("Deutsche Bank").
     Deutsche Bank, a banking  company  organized under the laws of the Federal
     Republic of Germany,  provides,  along with its  various  subsidiaries,  a
     comprehensive   range  of  global  banking  and  financial  services  both
     domestically and abroad.

     As stated before,  Bankers Trust currently serves as investment adviser to
     the  Portfolio.  As a  result  of the  transaction  discussed  above  (the
     "Merger"),  and  applicable  provisions  of the 1940 Act,  the  investment
     advisory  agreement  between  the  Portfolio  and  Bankers  Trust could be
     considered  to have  automatically  terminated  on June 4, 1999. To ensure
     that  Bankers  Trust may  continue to serve as  investment  adviser to the
     Portfolio,  it is necessary for shareholders of the Portfolio to approve a
     new  investment  advisory  agreement with Bankers Trust (the "New Advisory
     Agreement").

*    WHY AM I BEING ASKED TO VOTE ON THE NEW ADVISORY AGREEMENT?

     The 1940 Act, which  regulates  investment  companies in the United States
     such as the Index Fund and the Portfolio,  requires a shareholder  vote to
     approve a new  advisory  agreement  following  certain  types of  business
     combinations. The Merger could be viewed as requiring shareholder approval
     of a new investment  advisory  agreement with respect to management of the
     Portfolio.  The New Advisory  Agreement became effective  immediately upon
     consummation  of the Merger and will continue in effect only upon approval
     of the Portfolio's shareholders (one of which is the Index Fund).

*    HOW DID THE MERGER AFFECT ME AS AN INDEX FUND SHAREHOLDER?

     The Index Fund and the Portfolio,  as well as their investment objectives,
     have not changed as a result of the Merger.  You still own the same shares
     in the  Index  Fund as you  did  prior  to the  Merger.  The New  Advisory
     Agreement  contains  substantially  the same terms and  conditions  as the
     agreement  in  effect  prior  to the  Merger,  except  for  the  dates  of
     execution,  effectiveness and initial term. If the New Advisory  Agreement
     is approved by you the shareholders, the agreement will continue in effect
     as described above.

*    DO  THE FEES  PAID  TO BANKERS  TRUST  INCREASE  UNDER  THE  NEW  ADVISORY
     AGREEMENT?

     No, the advisory fees paid to Bankers Trust  remain the same under the New
     Advisory Agreement.


*    WHAT ARE THE BENEFITS OF THE MERGER?

     There are  several  potential  positive  aspects  of the Merger you may be
     interested in. Most notably,  the combined  institution will be one of the
     largest  financial  institutions  in the  world,  as well as a leader in a
     number  of  important  categories,  such  as  asset  management,  custody,
     securities lending and related  businesses.  The financial strength of the
     combined  institution  coupled with the increased breadth and depth of its
     resources and capabilities are advantages the acquisition brings. Further,
     as a truly global  institution,  the  combined  entity will be in a unique
     position  to  provide   coverage,   services  and   products   that  other
     institutions might not be able to offer.

*    CAN YOU PLEASE TELL ME ABOUT THE CRIMINAL SANCTIONS?

     On  March  11,  1999,  Bankers  Trust  announced  that it had  reached  an
     agreement  with  the  United  States  Attorney's  Office  in the  Southern
     District of New York to resolve an investigation  concerning inappropriate
     transfers  of unclaimed  funds and related  record-keeping  problems  that
     occurred  between 1994 and 1996.  Pursuant to its agreement  with the U.S.
     Attorney's  Office,  Bankers Trust pleaded guilty to misstating entries in
     the bank's  books and  records  and agreed to pay $53.5  million  fines to
     state and federal  authorities.  On July 26,  1999,  the federal  criminal
     proceedings were concluded with Bankers Trust's formal sentencing.

     As a result of the plea, absent an order from the SEC, Bankers Trust would
     not be able to continue  to provide  investment  advisory  services to the
     Portfolio or the Fund. The SEC has granted Bankers Trust a temporary order
     under Section 9(c) of the Act to permit  Bankers Trust and its  affiliates
     to  continue  to  provide  investment   advisory  services  to  registered
     investment  companies,  and Bankers Trust, pursuant to Section 9(c) of the
     Act, has filed an application for a permanent order. If the SEC refuses to
     grant a permanent  order,  shareholders  will receive  supplemental  proxy
     materials  requesting approval to release any amounts held in escrow up to
     the time of the refusal and such other action as deemed appropriate by the
     Portfolio Boards.

*    ARE THE BANKERS TRUST  CRIMINAL SANCTIONS  RELATED TO THE MUTUAL FUND SIDE
     OF THEIR BUSINESS?

     No,  the events  leading  up to the guilty  pleas did not arise out of the
     investment advisory or mutual fund management  activities of Bankers Trust
     or its affiliates.

*    WHY DO I HAVE TO VOTE TWICE FOR  PRICEWATERHOUSECOOPERS IN THE SAME PROXY?

     PricewaterhouseCoopers  is the  auditor  for both the  Index  Fund and the
     Portfolio  (remember,  the Index Fund is a shareholder of the  Portfolio).
     Therefore,  we are  asking you to approve  the  selection  by the Board of
     PricewaterhouseCoopers  to serve as independent  accountants  for both the
     Fund and the Portfolio.

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