USAA MUTUAL FUND INC
N-30D, 1998-09-28
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Table of Contents
      USAA Family of Funds                                              1
      Message from the President                                        2
      Investment Review                                                 4
      Message from the Manager                                          5
      Financial Information:
         Independent Auditors' Report                                   7
         Categories and Definitions                                     8
         Portfolio of Investments                                       9
         Notes to Portfolio of Investments                             16
         Statement of Assets and Liabilities                           17
         Statement of Operations                                       18
         Statements of Changes in Net Assets                           19
         Notes to Financial Statements                                 20


Important Information
Through  our  ongoing  efforts to reduce  expenses  and  respond to  shareholder
requests, your annual and semiannual report mailings are "streamlined." One copy
of each report is sent to each address,  rather than to every registered  owner.
For many  shareholders  and their families,  this eliminates  duplicate  copies,
saving paper and postage costs to the Fund.

If you are the  primary  shareholder  on at least  one  account,  prefer  not to
participate in streamlining, and would like to continue receiving one report per
registered account owner, you may request this in writing to:

            USAA Investment Management Company
            Attn: Report Mail
            9800 Fredericksburg Road
            San Antonio, TX 78284-8916

or phone a Mutual Fund Representative at 1-800-531-8448 during business hours.

This  report is for the  information  of the  shareholders  and  others who have
received a copy of the currently  effective  prospectus of the USAA Money Market
Fund,  managed by USAA Investment  Management  Company (IMCO). It may be used as
sales literature only when preceded or accompanied by a current prospectus which
gives further details about the Fund.

USAA  with  the  eagle is  registered  in the U.S.  Patent &  Trademark  Office.
(Copyright)1998, USAA. All rights reserved.




USAA Family of Funds Summary

         Fund                                             Minimum
       Type/Name                     Volatility          Investment*
       ---------                     ----------          ----------

 CAPITAL APPRECIATION
===============================================================================
 Aggressive Growth                 Very high               $3,000
 Emerging Markets(1)               Very high               $3,000
 First Start Growth                Moderate to high        $3,000
 Gold(1)                           Very high               $3,000
 Growth                            Moderate to high        $3,000
 Growth & Income                   Moderate                $3,000
 International(1)                  Moderate to high        $3,000
 S&P 500(Registered Trademark)
   Index(2)                        Moderate                $3,000
 Science & Technology(5)           Very high               $3,000
 World Growth(1)                   Moderate to high        $3,000
       
 ASSET ALLOCATION            
===============================================================================
 Balanced Strategy(1)              Moderate                $3,000
 Cornerstone Strategy(1)           Moderate                $3,000
 Growth and Tax
  Strategy(3)                      Moderate                $3,000
 Growth Strategy(1)                Moderate to high        $3,000
 Income Strategy                   Low to moderate         $3,000
          
 INCOME - TAXABLE         
===============================================================================
 GNMA                              Low to moderate         $3,000
 Income                            Moderate                $3,000
 Income Stock                      Moderate                $3,000
 Short-Term Bond                   Low                     $3,000
              
 INCOME - TAX EXEMPT        
===============================================================================
 Long-Term(3)                      Moderate                $3,000
 Intermediate-Term(3)              Low to moderate         $3,000
 Short-Term(3)                     Low                     $3,000
 State Bond Income(3)**            Moderate                $3,000
       
 MONEY MARKET        
===============================================================================
 Money Market(4)                   Very low                $3,000
 Tax Exempt
  Money Market(3),(4)              Very low                $3,000
 Treasury Money
  Market Trust(4)                  Very low                $3,000
 State Money Market(3),(4)**       Very low                $3,000

(1)  Foreign  investing is subject to additional  risks,  which are discussed in
     the funds' prospectuses.

(2)  S&P 500 (Registered Trademark) is a trademark of The McGraw-Hill Companies,
     Inc. and has been licensed for use. The Product is not  sponsored,  sold or
     promoted  by   Standard  &  Poor's,   and   Standard  &  Poor's   makes  no
     representation regarding the advisability of investing in the Product.

(3)  Some  income  may be  subject  to  state  or  local  taxes  or the  federal
     alternative minimum tax.

(4)  An investment in a money market fund is neither  insured nor  guaranteed by
     the U.S.  Government,  and there is no assurance that any of the funds will
     be able to maintain a stable net asset value of $1 per share.

(5)  This Fund may be more  volatile  than a fund that  diversifies  across many
     industries.

 *   The  InveStart (Registered Trademark)  program is available  for  investors
     without the $3,000 initial investment  required to open an IMCO mutual fund
     account.  A mutual fund account can be opened with no initial investment if
     you elect to have monthly automatic investments of at least $50 from a bank
     account.  InveStart  is not  available on  tax-exempt  funds or the S&P 500
     Index Fund. The minimum initial investment for IRAs is $250, except for the
     $2,000 minimum  required for the S&P 500 Index Fund. IRAs are not available
     for tax-exempt  funds. The Growth and Tax Strategy Fund is not available as
     an  investment  for your IRA  because  the  majority  of its  income is tax
     exempt.

**   California,  Florida,  New York,  Texas,  and Virginia funds available to
     residents only.  

Non-deposit investment products are not insured by the FDIC, are not deposits or
other  obligations  of, or guaranteed  by, USAA Federal  Savings  Bank,  and are
subject to investment risks, and may lose value.

For more complete  information about the mutual funds managed and distributed by
USAA IMCO,  including  charges and expenses,  please call  1-800-531-8181  for a
prospectus. Read it carefully before you invest.


Message from the President


[PHOTOGRAPH OF PRESIDENT AND VICE CHAIRMAN OF THE BOARD, MICHAEL J.C. ROTH, CFA 
APPEARS HERE]


On June 14, 1998, my wife attended a baby shower given for her daughter, Andrea.
That evening, in addition to many nice gifts, Andrea had another surprise, a new
baby boy,  James Kade  Broyles.  James was our fourth  grandchild  to receive an
Investart(Registered Trademark)  account.  His account is in the USAA Growth &
Income  Fund.  These accounts point up at this time some things I have long 
believed.

Shortly  after we opened  James'  account,  the stock  market  began to feel the
effects  of  long-simmering  problems.  There  was the Asian  crisis,  Russia in
turmoil,  a worsening trade deficit,  and very high stock valuations.  Suddenly,
the mood  changed.  There were several days of market drops well over 100 points
on the Dow. The August 8 edition of The Economist has a picture of a bear on the
cover  under the  caption  "Grin and bear it." So, how do we feel about the four
InveStart accounts? We feel just fine!

The reason is that we have a match between our objective and our risk tolerance.
These  accounts  are aimed at events 15 to 17 years from now,  college  for four
grandchildren.  We are  certain  that  between  then and now,  the  market  will
fluctuate.  I think we're better off to keep adding to the  InveStart  accounts,
because I believe the risk and potential reward are in harmony.

Whatever  your  investment  situation,  I believe it is possible to achieve this
kind of match  between  risk and  potential  reward  that can help you with your
investment program.

Sincerely,


Michael J.C. Roth, CFA
President and
Vice Chairman of the Board


Past performance is no guarantee of future results.

A  systematic  plan,  such as  Investart,  does not  assure a profit or  protect
against loss in declining markets.

For more  information  about mutual funds managed and  distributed by USAA IMCO,
including charges and expenses, please call for a prospectus.  Read it carefully
before investing.






Investment Review

USAA MONEY MARKET FUND

OBJECTIVE:   Highest  income   consistent  with   preservation  of  capital  and
maintenance of liquidity.

TYPES OF INVESTMENTS:  High-quality debt instruments with maturities of 397 days
or less.



- -------------------------------------------------------------------------------
                                           7/31/97               7/31/98   
===============================================================================
  Net Assets                           $2,161.7 Million     $2,491.5 Million
  Net Asset Value Per Share                 $1.00                 $1.00
- -------------------------------------------------------------------------------


- -------------------------------------------------------------------------------
AVERAGE ANNUAL TOTAL RETURNS AND CURRENT YIELD AS OF 7/31/98
===============================================================================
        1 Year           5 Years           10 Years           7-day Yield
         5.45%            4.97%              5.67%               5.27%
- -------------------------------------------------------------------------------

Total return equals income yield and assumes  reinvestment of all dividends.  No
adjustment has been made for taxes payable by shareholders  on their  reinvested
income dividends. The performance data quoted represent past performance and are
not an  indication  of future  results.  An  investment  in this Fund is neither
insured nor  guaranteed  by the U.S.  Government,  and there can be no assurance
that the Fund will  maintain  a stable net asset  value of $1.00 per share.  The
7-day yield quotation more closely  reflects  current  earnings of the Fund than
the total return quotation.



                        7-DAY YIELD COMPARISON

A chart in the form of a line graph appears here  illustrating the comparison of
the  7-day  yield  of the  USAA  Money  Market  Fund to the  7-day  yield of the
IBC/Donoghue's Money Fund Averages (TradeMark)/First Tier from 7/97 to 7/98.

                                                      IBC/Donoghue Money Fund
                USAA Money                             Averages (TradeMark)/
                Market Fund                                  First Tier
                -----------                          ------------------------

07/29/97          5.31%                                       4.93%
08/26/97          5.28%                                       4.93%
09/30/97          5.33%                                       4.95%
10/28/97          5.33%                                       5.05%
11/25/97          5.41%                                       4.96%
12/30/97          5.54%                                       5.07%
01/27/98          5.39%                                       4.99%
02/24/98          5.29%                                       4.94%
03/31/98          5.22%                                       4.93%
04/28/98          5.27%                                       4.90%
05/26/98          5.26%                                       4.90%
06/30/98          5.29%                                       4.94%
07/28/98          5.27%*                                      4.92%*

Data represent the last Tuesday of each month.

*Ending date 7/28/98

The graph tracks the USAA Money Market Fund's 7-day yield against IBC/Donoghue's
Money Fund Averages(TradeMark)/First  Tier, an average of first-tier major money
market fund yields.




Message from the Manager

[PHOTOGRAPH OF PORTFOLIO MANAGER, PAMELA K. BLEDSOE, CFA APPEARS HERE]

THE MARKET
Political  and economic  unrest in countries  around the world are impacting the
U.S.  debt  markets.  Investors  continue to prefer the  quality  and  stability
offered  by the U.S.  treasury  market as Asia,  Russia,  and  Indonesia  remain
headline news. The increased  interest in the U.S. market along with the virtual
lack of any signs of inflation has helped to keep interest rates low. Inflation,
as  measured by the  Consumer  Price Index  (CPI),  has been  subdued as import,
commodity,  and retail prices are either stable or declining.  While the country
experiences one of the lowest  unemployment  rates in history,  labor costs have
been increasing. However, productivity gains continue to offset any inflationary
impact. Until the economy shows signs of inflation, we do not expect the Federal
Reserve to make any adjustments to monetary policy.

The  USAA  Money  Market  Fund is  managed  to  maximize  current  income  while
maintaining a stable net asset value of $1.00. In today's environment,  this has
been  accomplished  by  selectively  buying  one-year  securities  balanced with
aggressive  management of offerings with shorter  maturities  such as commercial
paper and variable rate demand notes.

While past  performance  is no  guarantee of future  results,  for the 12 months
ending July 31,  1998,  your Fund ranked 16 out of 265 retail Money Market funds
according to IBC Financial Data, Inc. with a yield of 5.45%. The average for the
category over the same time period was 5.08%.



                               PORTFOLIO MIX

A pie chart is shown here  depicting  the  Portfolio Mix as of July 31, 1998 for
the USAA Money Market Fund:  Bonds/Notes - 49.2%*;  Variable Rate Demand Notes -
23.8%*; Commercial Paper - 9.8%*; and CDs - 16.6%*.

*Percentages are of the Net Assets and may or may not equal 100%.




                       CUMULATIVE PERFORMANCE COMPARISON

A chart  in the  form of a line  graph  appears  here,  illustrating  a  $10,000
hypothetical investment in the USAA Money Market Fund for the period of 07/31/88
through 07/31/98. The data points from the graph are as follows:


      USAA Money Market Fund
- -----------------------------------

07/88                     $10,000
12/88                      10,333
06/89                      10,800
12/89                      11,257
06/90                      11,696
12/90                      12,152
06/91                      12,536
12/91                      12,889
06/92                      13,156
12/92                      13,378
06/93                      13,581
12/93                      13,781
06/94                      14,011
12/94                      14,339
06/95                      14,757
12/95                      15,168
06/96                      15,556
12/96                      15,962
06/97                      16,378
12/97                      16,824
06/98                      17,272
07/98                      17,353

Data from 7/31/88 through 7/31/98

Past  performance  is no  guarantee  of  future  results  and the  value of your
investment will vary according to the USAA Money Market Fund's  performance.  An
investment  in  this  Fund  is  neither  insured  nor  guaranteed  by  the  U.S.
Government,  and there can be no assurance  that the Fund will maintain a stable
net asset value of $1 per share.  For 7-day yield  information,  please refer to
the Fund's Investment Review page.

See page 9 for a complete listing of the Portfolio of Investments.




Independent Auditors' Report

The Shareholders and Board of Directors

USAA MONEY MARKET FUND:

We have audited the accompanying statement of assets and liabilities,  including
the portfolio of  investments of the USAA Money Market Fund, a portfolio of USAA
Mutual Fund,  Inc., as of July 31, 1998 and the related  statement of operations
for the year then ended, the statements of changes in net assets for each of the
years in the two-year period then ended, and financial highlights,  presented in
note 7 to the  financial  statements,  for each of the years or  periods  in the
five-year period then ended. These financial statements and financial highlights
are the  responsibility of the Company's  management.  Our  responsibility is to
express an opinion on these financial  statements and financial highlights based
on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable  assurance  about  whether the  financial  statements  and  financial
highlights are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements and financial  highlights.  Our procedures  included  confirmation of
securities owned as of July 31, 1998, by  correspondence  with the custodian and
brokers.  An audit also includes  assessing the accounting  principles  used and
significant  estimates  made by  management,  as well as evaluating  the overall
financial  statement  presentation.   We  believe  that  our  audits  provide  a
reasonable basis for our opinion.

In our opinion,  the financial  statements and financial  highlights referred to
above present fairly, in all material  respects,  the financial  position of the
USAA Money Market Fund as of July 31, 1998,  the results of its  operations  for
the year then ended,  the changes in its net assets for each of the years in the
two-year period then ended,  and the financial  highlights for each of the years
or periods in the  five-year  period then ended,  in conformity  with  generally
accepted accounting principles.



                                            KPMG Peat Marwick LLP


San Antonio, Texas
September 4, 1998





USAA MONEY MARKET FUND
CATEGORIES AND DEFINITIONS
PORTFOLIO OF INVESTMENTS

July 31, 1998


Fixed Rate Instruments - consist of commercial  paper,  certificates of deposit,
banker's acceptances, and notes. The interest rate is constant to maturity.

Put Bonds - provide the right to sell the bond at face value at specific  tender
dates prior to final maturity.  The put feature shortens the effective  maturity
to the next tender date.

Variable  Rate Demand Notes (VRDN) - provide the right,  on any business day, to
sell the  security  at face  value on  either  that  day or in seven  days.  The
interest rate is adjusted at a stipulated daily,  weekly, or monthly interval to
a rate that reflects current market  conditions.  The effective  maturity is the
next date the holder may sell the security back to the issuer. Most VRDNs 
possess a credit enhancement.

Adjustable  Rate Notes - similar to VRDNs in the fact that the interest  rate is
adjusted periodically to reflect current market conditions. These interest rates
are  adjusted  at a given time,  such as monthly or  quarterly.  However,  these
securities  do not offer the right to sell the  security  at face value prior to
maturity.

Credit  Enhancement  (CRE) - adds the financial  strength of the provider of the
enhancement to support the issuer's ability to repay the principal when due. The
enhancement  may be provided by either a high quality bank,  insurance  company,
corporation,  or a collateral trust. Typically, the rating agencies evaluate the
security  based  upon  the  credit  standing  of  the  provider  of  the  credit
enhancement,  rather than the credit  standing of the issuer.  If the securities
are enhanced by a bond insurer,  scheduled  principal and interest  payments are
insured by the following:

     (1)    MBIA, Inc.

The insurance does not guarantee the market value of the municipal bonds.


PORTFOLIO DESCRIPTION ABBREVIATIONS
     CD     Certificate of Deposit
     COP    Certificate of Participation
     CP     Commercial Paper
     IDA    Industrial Development Authority/Agency
     IDB    Industrial Development Board
     MTN    Medium-Term Note
     RB     Revenue Bond




USAA MONEY MARKET FUND
PORTFOLIO OF INVESTMENTS
(IN THOUSANDS)
July 31, 1998



    Principal                                   Coupon
     Amount             Security                 Rate     Maturity     Value
- ------------------------------------------------------------------------------
                         FIXED RATE INSTRUMENTS (33.7%)
          Banks - Major Regional
$40,000   BankBoston N. A., Bank Notes            5.57%   9/03/98    $  40,000
 25,000   Huntington National Bank, Bank Notes    5.80    9/22/98       24,998
 25,000   MBNA America Bank, N.A., CD             5.62    8/31/98       25,000
 14,500   Mercantile Safe Deposit & Trust 
            Co., CD                               6.30    8/16/99       14,576
 30,000   National Bank of Canada, CD             5.72    3/08/99       29,993
 17,000   Norwest Corp. MTN, Series G             6.00   10/13/98       17,002
- ------------------------------------------------------------------------------
                                                                       151,569
- ------------------------------------------------------------------------------

          Banks - Money Center
 25,000   Bankers Trust Co., CD                   5.76    4/26/99       24,992
 25,000   Bankers Trust Co., CD                   5.70    7/23/99       24,988
 30,000   Banque Nationale de Paris, CD           5.89   10/15/98       29,997
 35,000   Banque Nationale de Paris, CD           5.52    2/18/99       34,965
 25,000   Canadian Imperial Bank of Commerce, CD  5.82    9/30/98       24,997
 30,000   Commerzbank AG, CD                      5.52    2/02/99       29,978
 30,000   Commerzbank AG, CD                      5.54    2/02/99       29,985
 25,000   Credit Agricole Indosuez, CD            5.73    4/16/99       24,992
 30,000   Deutsche Bank AG, CD                    5.70    3/30/99       29,984
 30,000   Macquarie Bank Limited, CP              5.58    8/17/98       29,926
 10,000   Macquarie Bank Limited, CP              5.62    8/20/98        9,970
 25,000   Societe Generale, CD                    5.88    8/07/98       25,000
 30,000   Societe Generale, CD                    5.95    8/28/98       29,999
 15,000   Societe Generale, CD                    5.90   10/20/98       14,997
 20,000   Societe Generale, CD                    5.70    8/03/99       19,988
 25,000   Unibanco-Uniao de Bancos
           Brasilieros S.A., CP                   5.45    6/28/99       23,747
- ------------------------------------------------------------------------------
                                                                       408,505
- ------------------------------------------------------------------------------

          Electric Utilities
 20,500   National Rural Utilities Corp., 
            MTN, Series C                        6.37   12/15/98        20,535
- ------------------------------------------------------------------------------

          Finance - Consumer
 41,084   Aristar, Inc., CP                      5.63    8/06/98        41,052
 50,000   Aristar, Inc., CP                      5.63    8/14/98        49,898
 20,040   Associates Corp. of North America,
           Senior Notes                          6.00    3/15/99        20,076
 18,465   Associates Corp. of North America,
           Senior Notes                          6.25    3/15/99        18,526
 30,000   Ford Credit Europe, CP                 5.66    8/04/98        29,986
 12,709   Ford Motor Credit Co., Global Notes    5.63   12/15/98        12,697
 14,750   General Motors Acceptance Corp., MTN   5.45    3/01/99        14,724
- ------------------------------------------------------------------------------
                                                                       186,959
- ------------------------------------------------------------------------------

          Finance - Diversified
 20,181   General Electric Capital Corp., CP     5.68    8/03/98        20,175
 30,000   Heller Financial, Inc., CP             5.70    8/05/98        29,981
- ------------------------------------------------------------------------------
                                                                        50,156
- ------------------------------------------------------------------------------

          Healthcare - Miscellaneous
  9,900   Medical Building Funding V LLC, CP,
              Series 1994 (CRE)                  5.74    8/04/98         9,895
- ------------------------------------------------------------------------------

          Hospitals
 13,145   Bergen, NJ, County Improvement Auth.,
            Notes (CRE)                          5.74    2/17/99        13,145
- ------------------------------------------------------------------------------
          Total fixed rate instruments (cost: $840,764)                840,764
- ------------------------------------------------------------------------------

                                PUT BONDS (12.2%)
          Electric Utilities
 54,700   IDA of New Hampshire, Pollution
            Control RB, Series E (CRE)           5.64    5/01/21        54,700
 65,000   IDB of Columbia, AL, RB,
            Series 1997 (a)                      5.65   11/01/21        65,000
- ------------------------------------------------------------------------------
                                                                       119,700
- ------------------------------------------------------------------------------

         General Obligations
 38,200  Cleveland, OH, Notes, Series 1994
           (CRE)                                 5.62    5/15/24        38,200
- ------------------------------------------------------------------------------

         Healthcare - Specialized Services
 25,350  Central Plains Clinic Ltd. RB,
          Series 1996 (CRE)                      5.62    9/01/17        25,350
 14,150  Central Plains Clinic Ltd. RB,
          Series 1997 (CRE)                      5.62   10/16/17        14,150
- ------------------------------------------------------------------------------
                                                                        39,500
- ------------------------------------------------------------------------------

         Leisure Time
  8,460  Sault Ste. Marie Tribe Building Auth.,
           RB, Series 1996B (CRE)                6.15    6/01/03         8,460
- ------------------------------------------------------------------------------

         Nursing/Continuing Care Centers
  7,000  Bexar County, TX, Health Facilities
           Development RB (CRE)                  5.95    2/01/22         7,000
- ------------------------------------------------------------------------------

         Oil - Domestic Integrated
 26,200  Madison County, IL, RB, Series 
           1997A (a)                             5.59   12/01/37        26,200
- ------------------------------------------------------------------------------

         Oil & Gas -  Refining/Manufacturing
 39,000  IDB  of the  Parish  of Calcasieu, 
           LA, Inc. Environmental RB, Series
           1996 (CRE)                            5.61    7/01/26        39,000
- ------------------------------------------------------------------------------

         Paper & Forest Products
 10,000  IDA of Bedford County, VA, RB,
           Series 1995B (CRE)                    5.70   12/01/25        10,000
 16,000  IDA of Bedford County, VA, RB,
           Series 1995C (CRE)                    5.70   12/01/25        16,000
- ------------------------------------------------------------------------------
                                                                        26,000
- ------------------------------------------------------------------------------
            Total put bonds (cost: $304,060)                           304,060
- ------------------------------------------------------------------------------

                    VARIABLE RATE DEMAND NOTES (23.8%)
         Appropriated Debt
  9,950  City of Gardena, CA, COP, Series
           1995 (CRE)                           6.50    7/01/25          9,950
  9,135  City of Gardena, CA, COP, Series 
           1996 (CRE)                           6.50   11/01/19          9,135
- ------------------------------------------------------------------------------
                                                                        19,085
- ------------------------------------------------------------------------------

         Asset Backed Securities
  8,515  Capital One Funding Corp., Notes,
           Series 1993A (CRE)                    5.62    6/02/08          8,515
 19,537  Capital One Funding Corp., Notes,
           Series 1995C (CRE)                    5.62   10/01/15         19,537
 22,104  Capital One Funding Corp., Notes,
           Series 1996E (CRE)                    5.62    7/02/18         22,104
- -------------------------------------------------------------------------------
                                                                         50,156
- -------------------------------------------------------------------------------

         Auto Parts
 14,800  Alabama IDA RB (Rehau Project) (CRE)   5.67    10/01/19         14,800
  9,255  Bardstown, KY, RB, Series
           1994 (CRE)                           5.67     6/01/24          9,255
 11,000  Bardstown, KY, RB, Series 1995 (CRE)   5.67     3/01/25         11,000
- -------------------------------------------------------------------------------
                                                                         35,055
- -------------------------------------------------------------------------------

         Broadcasting - Radio & TV
 50,300  New Jersey Economic Development 
           Auth. RB(CRE) (a)                    5.64    10/01/21         50,300
- -------------------------------------------------------------------------------

         Buildings
 12,000  Fontana, CA, COP (CRE)                 6.15    10/01/20         12,000
  7,400  San Bernardino County, CA, 
           COP (CRE)                            6.00    11/01/25          7,400
- -------------------------------------------------------------------------------
                                                                         19,400
- -------------------------------------------------------------------------------

          Chemicals
  8,555   Wyckoff Chemical Company, Inc., 
            Note, Series 1997 (CRE)             5.64     2/01/27          8,555
- -------------------------------------------------------------------------------

          Electrical Equipment
 10,000   Mississippi Business Finance Corp.,
            Series 1998 (a)                     5.64     2/01/23         10,000
- -------------------------------------------------------------------------------

          Finance - Diversified
 22,360   KBL Capital Fund, Inc., Installment
            #1 Notes, Series A (CRE)            5.64     5/01/27         22,360
- -------------------------------------------------------------------------------

          General Obligations
 15,795   San Bernardino County, CA, COP,
            Glen Helen Project, Series D (CRE)  5.91     3/01/24         15,795
- -------------------------------------------------------------------------------

          Healthcare - Diversified
 27,750   Wenatchee Valley Clinic, P.S., WA, 
            Bonds, Series 1996 (CRE)            5.67    11/12/17         27,750
- -------------------------------------------------------------------------------

          Healthcare - Specialized Services
  6,900   Mason City Clinic, P.C., IA, Bonds,
            Series 1992 (CRE)                   5.75     9/01/22          6,900
  9,045   Navigator Ventures, LLC, Notes,
            Series 1997 (CRE)                   5.64     5/01/27          9,045
- -------------------------------------------------------------------------------
                                                                         15,945
- -------------------------------------------------------------------------------

          Hospitals
 20,000   Crouse Health Hospital, Inc., RB,
            Series 1996 (CRE)                   5.75     7/01/17         20,000
 15,800   Dome Corp., Bonds, Series 1991 (CRE)  5.70     8/31/16         15,800
- -------------------------------------------------------------------------------
                                                                         35,800
- -------------------------------------------------------------------------------

          Leisure Time
  9,000   Fox Valley Ice Arena, IL, RB,
            Series 1997 (CRE)                   5.70     7/01/27          9,000
 14,390   Greenville Memorial Auditorium 
            District Public Facilities, SC,
            COP, Series 1996C (CRE)             5.75     9/01/14         14,390
- -------------------------------------------------------------------------------
                                                                         23,390
- -------------------------------------------------------------------------------

          Manufacturing - Specialized
 15,000   Loma Co. L. L. C. Floating Rate,
            Option Notes (CRE)                  5.67    12/01/08         15,000
 13,000   Savannah Economic Development 
            Auth., GA, RB, Series 1998 (CRE)    5.69     6/01/18         13,000
- -------------------------------------------------------------------------------
                                                                         28,000
- -------------------------------------------------------------------------------

          Multi-Family Housing
 12,155   Arbor Properties, Inc., Notes (CRE)   5.70    11/01/21         12,155
  6,150   Arbor Properties, Inc., Notes (CRE)   5.70     6/01/22          6,150
- -------------------------------------------------------------------------------
                                                                         18,305
- -------------------------------------------------------------------------------

          Nursing/Continuing Care Centers
  9,200   Assisted Living Funding LLC, Bonds,
            Series 1997 (CRE)                   5.70    10/01/17          9,200
 32,000   Lincolnwood Funding Corp. RB,
            Series 1995A (CRE)                  5.70     8/01/15         32,000
 10,465   Missouri Health and Educational
            Facilities Auth. RB, Series
            1996B (CRE)                         5.75    12/01/16         10,465
- -------------------------------------------------------------------------------
                                                                         51,665
- -------------------------------------------------------------------------------

          Real Estate - Other
 16,275   First Illinois Funding Corp. Project,
            RB, Series 1996 (CRE)               5.70     9/01/26         16,275
 17,200   H/M Partners, LLC, Bond (CRE)         5.70    10/01/20         17,200
 14,220   HGR-1, LLC, Notes, Series 1996 (CRE)  5.65     9/15/46         14,220
 12,000   Houston County, GA, IDA,RB (CRE)      5.72     8/01/12         12,000
 25,000   LAM Funding LLC, Notes, Series A
           (CRE)                                5.64    12/15/27         25,000
 10,715   Physicians Real Estate, LLP, Notes,
           Series 1998 (CRE)                    5.75     2/01/18         10,715
  7,000   PRA at Glenwood Hills Corporate
           Centre, LLC, Notes, Series  
           1997 (CRE)                           5.64     8/01/27          7,000
  9,260   Shepherd Capital, LLC, Notes,
           Series 1997 (CRE)                    5.65     7/15/47          9,260
- -------------------------------------------------------------------------------
                                                                        111,670
- -------------------------------------------------------------------------------

          Special Assessment/Tax/Fee
 20,600   County of Cuyahoga, OH, RB,
            Series 1992B (CRE)                  5.67     6/01/22         20,600
- -------------------------------------------------------------------------------

          Textiles - Home Furnishings
 10,000   Alabama IDA RB (Fieldcrest Project)
            (CRE)                               5.70     7/01/21         10,000
- -------------------------------------------------------------------------------

          Water/Sewer Utilities - Municipal
 18,040   Hesperia Public Financing Auth.,
            CA, RB, Series 1998A (CRE)          6.00     6/01/26         18,040
- -------------------------------------------------------------------------------
            Total variable rate demand notes (cost: $591,871)           591,871
- -------------------------------------------------------------------------------

                  ADJUSTABLE RATE NOTES (29.7%)
          Banks - Major Regional
 40,000   American Express Centurion Bank,
            Bank Notes                          5.60     1/14/99        40,000
 40,000   Comerica Bank, Bank Note              5.55     6/10/99        39,976
 15,000   Huntington National Bank, MTN         5.74     1/13/99        15,005
 35,000   Long Lane Master Trust, Notes,
            Series 1997C (a), (b)               5.75    11/02/98        35,000
 14,800   Long Lane Master Trust, Notes,
            Series 1998A (a), (b)               5.71     1/20/99        14,800
 20,290   Long Lane Master Trust, Notes,
            Series 1998B (a), (b)               5.70     4/30/99        20,290
 17,000   SouthTrust Bank, Bank Notes           5.56     9/08/98        16,999
- ------------------------------------------------------------------------------
                                                                       182,070
- ------------------------------------------------------------------------------

          Banks - Money Center
 40,000   Bankers Trust, NY, Corp. Notes (a)    5.61     2/10/99        39,996
 30,000   Bankers Trust, NY, Corp. Notes (a)    5.68     2/19/99        29,998
 18,000   Barnett Bank, Inc., MTN, Series D     5.81    12/28/98        18,013
- ------------------------------------------------------------------------------
                                                                        88,007
- ------------------------------------------------------------------------------

         Finance - Consumer
 40,000  American Honda Finance Corp., MTN (a)  5.72     8/03/98        40,000
 25,000  American Honda Finance Corp., MTN (a)  5.68    10/22/98        25,000
 15,000  American Honda Finance Corp., MTN (a)  5.69     1/21/99        15,000
 30,000  American Honda Finance Corp., MTN (a)  5.66     4/09/99        30,000
 50,000  Chrysler Financial Corp., MTN, 
           Series Q                             5.66     2/03/99        50,011
 60,000  General Motors Acceptance Corp.,
           MTN                                  5.81     1/29/99        60,051
 30,000  Household Finance Corp., MTN           5.63     1/21/99        30,000
 25,000  Household Finance Corp., MTN           5.64     3/09/99        25,000
 25,000  Household Finance Corp., MTN           5.64     4/30/99        25,000
- ------------------------------------------------------------------------------
                                                                       300,062
- ------------------------------------------------------------------------------

         Finance - Diversified
 25,000  General Electric Capital Corp., MTN    5.56    6/08/99         24,990
 50,000  Sanwa Business Credit Corp.,  Bonds
          (CRE) 1, (a)                          5.64    5/20/99         49,996
- ------------------------------------------------------------------------------
                                                                        74,986
- ------------------------------------------------------------------------------

         Leasing
 50,000  PHH Corp., MTN                         5.60    2/05/99         49,997
 45,000  PHH Corp., MTN                         5.73    7/12/99         44,996
- ------------------------------------------------------------------------------
                                                                        94,993
- ------------------------------------------------------------------------------
         Total adjustable rate notes (cost: $740,118)                  740,118
- ------------------------------------------------------------------------------
         Total investments (cost: $2,476,813)                       $2,476,813
==============================================================================


                          PORTFOLIO SUMMARY BY INDUSTRY
                          -----------------------------

            Banks - Money Center                                19.9%
            Finance Consumer                                    19.5
            Banks - Major Regional                              13.4
            Finance - Diversified                                5.9
            Electric Utilities                                   5.6
            Real Estate - Other                                  4.5
            Leasing                                              3.8
            Nursing/Continuing Care Centers                      2.4
            Healthcare - Specialized Services                    2.2
            General Obligations                                  2.2
            Broadcasting - Radio & TV                            2.0
            Asset Backed Securities                              2.0
            Hospitals                                            2.0
            Oil & Gas - Refining / Manufacturing                 1.6
            Auto Parts                                           1.4
            Leisure Time                                         1.3
            Manufacturing - Specialized                          1.1
            Healthcare - Diversified                             1.1
            Oil - Domestic Integrated                            1.1
            Paper & Forest Products                              1.0
            Other                                                5.4
                                                               -----
                                                                99.4%
                                                               =====




USAA MONEY MARKET FUND
NOTES TO PORTFOLIO OF INVESTMENTS


July 31, 1998


GENERAL NOTES
Values of securities  are  determined by procedures  and practices  discussed in
note 1 to the financial statements.

The cost of securities for federal income tax purposes is approximately the same
as that reported in the financial statements.

The percentages shown represent the percentage of the investments to net assets.
Investments in U.S. dollar denominated securities issued by domestic branches or
subsidiaries  of foreign banks or companies were 17.6% of net assets at July 31,
1998.


SPECIFIC NOTES
(a) Security is exempt from  registration  under the Securities Act of 1933. Any
resale of this security in the United States may occur in an exempt  transaction
to a qualified institutional buyer as defined by the Rule 144A.

(b) Illiquid securities valued using methods determined by the Fund's investment
manager under the general  supervision  of the Board of  Directors.  At July 31,
1998, these securities represented 2.8% of the net assets.


See accompanying notes to financial statements.





USAA MONEY MARKET FUND
STATEMENT OF ASSETS AND LIABILITIES
(IN THOUSANDS)
July 31, 1998




ASSETS
   Investments in securities                                         $2,476,813
   Cash                                                                  11,324
   Receivables:
      Capital shares sold                                                12,111
      Interest                                                           23,760
                                                                     ----------
         Total assets                                                 2,524,008
                                                                     ----------

LIABILITIES
   Securities purchased                                                  19,989
   Capital shares redeemed                                               11,179
   USAA Investment Management Company                                       373
   USAA Transfer Agency Company                                             340
   Accounts payable and accrued expenses                                    388
   Dividends on capital shares                                              266
                                                                    -----------
         Total liabilities                                               32,535
                                                                    -----------
            Net assets applicable to capital shares outstanding     $ 2,491,473
                                                                    ===========

REPRESENTED BY:
   Paid-in capital                                                  $ 2,491,473
                                                                    ===========
   Capital shares outstanding                                         2,491,473
                                                                    ===========
   Authorized shares of $.01 par value                                4,700,000
                                                                    ===========
   Net asset value, redemption price, and offering price per share  $      1.00
                                                                    ===========

See accompanying notes to financial statements.




USAA MONEY MARKET FUND 
STATEMENT OF OPERATIONS  
(IN  THOUSANDS)  
Year ended July 31, 1998


Net investment income:
   Interest income                                                   $132,399
                                                                     --------
   Expenses:
      Management fees                                                   5,238
      Transfer agent's fees                                             3,893
      Custodian's fees                                                    672
      Postage                                                             420
      Shareholder reporting fees                                          310
      Directors' fees                                                       4
      Registration fees                                                   185
      Professional fees                                                    47
      Other                                                                47
                                                                     --------
         Total expenses before reimbursement                           10,816
      Expenses reimbursed                                                (756)
                                                                     --------
         Total expenses after reimbursement                            10,060
                                                                     --------
            Net investment income                                    $122,339
                                                                     ========


See accompanying notes to financial statements.




USAA MONEY MARKET FUND 
STATEMENTS OF CHANGES IN NET ASSETS 
(IN THOUSANDS)  
Years ended July 31,



                                                        1998            1997
                                                   ---------------------------
From operations:
   Net investment income                           $  122,339       $  103,156
                                                   ---------------------------
Distributions to shareholders from:
   Net investment income                             (122,339)        (103,156)
                                                   ---------------------------
From capital share transactions:
   Proceeds from shares sold                        3,370,264        2,797,676
   Shares issued for dividends reinvested             118,246           99,655
   Cost of shares redeemed                         (3,158,728)      (2,564,389)
                                                   ---------------------------

      Increase in net assets from capital
        share transactions                            329,782          332,942
                                                   ---------------------------
Net increase in net assets                            329,782          332,942
Net assets:
   Beginning of period                              2,161,691        1,828,749
                                                   ---------------------------
   End of period                                   $2,491,473       $2,161,691
                                                   ===========================
Change in shares outstanding:
   Shares sold                                      3,370,264       2,797,676
   Shares issued for dividends reinvested             118,246          99,655
   Shares redeemed                                 (3,158,728)     (2,564,389)
                                                   ---------------------------
      Increase in shares outstanding                  329,782         332,942
                                                   ===========================


See accompanying notes to financial statements.





USAA MONEY MARKET FUND
NOTES TO FINANCIAL STATEMENTS

July 31, 1998


(1) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
USAA MUTUAL FUND, INC. (the Company),  registered  under the Investment  Company
Act of 1940,  as  amended,  is a  diversified,  open-end  management  investment
company  incorporated  under the laws of  Maryland  consisting  of ten  separate
funds. The information presented in this annual report pertains only to the USAA
Money  Market Fund (the Fund).  The Fund's  investment  objective is the highest
income  consistent  with  preservation  of capital and maintenance of liquidity.
USAA Investment Management Company (the Manager) seeks to achieve this objective
by investing the Fund's assets in  high-quality,  U.S.  dollar-denominated  debt
securities of domestic and foreign issuers which have been determined to present
minimal credit risk.

A.  Security  valuation - The value of each  security is  determined  (as of the
close of  trading  on the New  York  Stock  Exchange  on each  business  day the
Exchange is open) as set forth below:

1. Pursuant to Rule 2a-7 of the Securities and Exchange  Commission,  securities
in the Fund are stated at  amortized  cost,  which  approximates  market  value.
Repurchase agreements are valued at cost.

2.  Securities  which cannot be valued by the methods set forth  above,  and all
other assets,  are valued in good faith at fair value,  using methods determined
by the Manager under the general supervision of the Board of Directors.

B. Federal taxes - The Fund's policy is to comply with the  requirements  of the
Internal  Revenue Code  applicable  to  regulated  investment  companies  and to
distribute  substantially all of its income to its shareholders.  Therefore,  no
federal income or excise tax provision is required.

C.  Investments in securities - Security  transactions  are accounted for on the
date the securities are purchased or sold (trade date).  Gain or loss from sales
of investment  securities  is computed on the  identified  cost basis.  Interest
income is recorded on the accrual  basis.  Discounts  and premiums on securities
are amortized over the life of the respective securities.

D. Use of estimates - The preparation of financial statements in conformity with
generally accepted  accounting  principles requires management to make estimates
and  assumptions   that  may  affect  the  reported  amounts  in  the  financial
statements.

(2) LINES OF CREDIT
The Fund  participates  with other USAA funds in two joint short-term  revolving
loan  agreements  totaling  $850  million,  one with  USAA  Capital  Corporation
(CAPCO),  an affiliate of the Manager ($750 million  uncommitted),  and one with
NationsBank  of  Texas,  N.A.  ($100  million  committed).  The  purpose  of the
agreements is to meet  temporary or emergency cash needs,  including  redemption
requests that might  otherwise  require the untimely  disposition of securities.
Subject to availability under its agreement with CAPCO, the Fund may borrow from
CAPCO an amount up to 5% of the Fund's  total assets at CAPCO's  borrowing  rate
with no markup.  Subject to availability  under its agreement with  NationsBank,
the Fund may borrow from NationsBank an amount which,  when added to outstanding
borrowings  under the CAPCO  agreement,  does not exceed 25% of the Fund's total
assets at NationsBank's borrowing rate plus a markup. The Fund had no borrowings
under either of these agreements during the year ended July 31, 1998.

(3) DISTRIBUTIONS
Net  investment  income  is  accrued  daily  as  dividends  and  distributed  to
shareholders monthly. Distributions of realized gains from security transactions
not  offset by  capital  losses  are made in the  succeeding  fiscal  year or as
otherwise required to avoid the payment of federal taxes.

(4) INVESTMENT TRANSACTIONS
Cost of purchases and proceeds from  sales/maturities of securities for the year
ended July 31, 1998 were $ 21.8 billion and $21.5 billion, respectively.

(5) TRANSACTIONS WITH MANAGER
A. Management  fees - The investment  policies of the Fund and management of the
Fund's  portfolio are carried out by USAA  Investment  Management  Company.  The
Fund's management fees are computed at .24% of its annual average net assets.

The Manager has  voluntarily  agreed to limit the annual expenses of the Fund to
 .45% of its annual  average net assets.  Because the Fund's annual  expenses for
the year ended July 31, 1998 exceeded  .45%, the Manager has waived a portion of
its management fee to reduce the Fund's annual expense to .45%.

B. Transfer agent's fees - USAA Transfer Agency Company,  d/b/a USAA Shareholder
Account Services, an affiliate of the Manager,  provides transfer agent services
to the Fund  based on an  annual  charge  of $26 per  shareholder  account  plus
out-of-pocket expenses.

C.  Underwriting  services - The Manager  provides  exclusive  underwriting  and
distribution  of the Fund's  shares on a  continuing  best  efforts  basis.  The
Manager receives no commissions or fees for this service.


(6) TRANSACTIONS WITH AFFILIATES
USAA Investment Management Company is indirectly wholly owned by United Services
Automobile  Association  (the  Association),   a  large,  diversified  financial
services  institution.  At July 31, 1998,  the  Association  and its  affiliates
(including related employee benefit plans) owned 3.5 million shares (.1%) of the
Fund.

Certain directors and officers of the Fund are also directors,  officers, and/or
employees  of the Manager.  None of the  affiliated  directors or Fund  officers
received any compensation from the Fund.

<TABLE>


(7) FINANCIAL HIGHLIGHTS
Per share operating  performance for a share outstanding  throughout each period
is as follows:

<CAPTION>
                                                                                           Ten-Month
                                                                                           Period Ended
                                                      Year ended July 31,                     July 31,
                              --------------------------------------------------------------------------
                                  1998           1997            1996           1995             1994
                              --------------------------------------------------------------------------
<S>                           <C>            <C>              <C>            <C>              <C> 
Net asset value at
   beginning of period        $     1.00     $     1.00       $     1.00     $     1.00       $    1.00
Net investment income                .05            .05              .05            .05             .03
Distributions from net
   investment income                (.05)          (.05)            (.05)          (.05)           (.03)
                              --------------------------------------------------------------------------
Net asset value at
   end of period              $     1.00     $     1.00       $     1.00     $     1.00       $    1.00
                              ==========================================================================
Total return (%) *                  5.45           5.28             5.41           5.49             2.74
Net assets at
   end of period (000)        $2,491,473     $2,161,691       $1,828,749     $1,540,055       $1,006,020
Ratio of expenses to
   average net assets (%)            .45            .45              .45            .45              .46(a)
Ratio of expenses to
   average net assets
   excluding
   reimbursement (%)                 .48            .49              .51            .46             -
Ratio of net investment
   income to average net
   assets (%)                       5.32           5.16             5.27           5.44             3.28(a)

</TABLE>



  *Assumes reinvestment of all dividend income distributions during the period.
(a)Annualized. The ratio is not necessarily indicative of 12 months of
   operations.



DIRECTORS
Robert G. Davis, Chairman of the Board
Michael J.C. Roth, President and Vice Chairman of the Board
John W. Saunders, Jr., Vice President
Barbara B. Dreeben
Howard L. Freeman, Jr.
Robert L. Mason
Richard A. Zucker

INVESTMENT ADVISER, UNDERWRITER AND DISTRIBUTOR
USAA Investment Management Company
9800 Fredericksburg Road
San Antonio, Texas 78288

TRANSFER AGENT
USAA Shareholder Account Services
9800 Fredericksburg Road
San Antonio, Texas 78288

CUSTODIAN
State Street Bank and Trust Company
P.O. Box 1713
Boston, Massachusetts 02105

LEGAL COUNSEL
Goodwin, Procter & Hoar LLP
Exchange Place
Boston, Massachusetts 02109

INDEPENDENT AUDITORS
KPMG Peat Marwick LLP
112 East Pecan, Suite 2400
San Antonio, Texas 78205

TELEPHONE ASSISTANCE HOURS
Call toll free - Central Time
Monday - Friday 8:00 a.m. to 8:00 p.m.
Saturdays 8:30 a.m. to 5:00 p.m.

For Additional Information On Mutual Funds
1-800-531-8181, (in San Antonio) 456-7211
For account servicing, exchanges or redemptions
1-800-531-8448, (in San Antonio) 456-7202

Recorded Mutual Fund Price Quotes
24-Hour Service (from any phone)
1-800-531-8066, (in San Antonio) 498-8066

Mutual Fund TouchLine(Registered Trademark)
(from Touchtone phones only)
For account balance, last transaction or fund prices
1-800-531-8777, (in San Antonio) 498-8777








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