USAA MUTUAL FUND INC
N-30D, 1999-03-25
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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:
         Categories & Definitions                     7
         Portfolio of Investments                     8
         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)1999, 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 not insured or  guaranteed by the
     FDIC or any other  government agency.  Although  the fund seeks to preserve
     the  value of your  investment  at $1 per  share,  it is  possible  to lose
     money by investing in the fund.

(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 Investment  Management  Company,  including charges and operating 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]

The last half of 1998 was a fascinating time in the financial markets. While the
press,  as usual,  devoted most of its  attention to stock  markets,  the income
markets were perhaps even more interesting.

The turmoil in foreign debt markets coupled with the problems of a notable hedge
fund, set off an almost incredible wave of events. I use the word "wave" because
it so well describes the reaction that occurred in the U.S. Treasury  securities
market. We see this in the chronology of yields on the 30-year Treasury bond:

                 U.S. Treasury                30-year Yield
                --------------------------------------------
                 August 3, 1998                   5.66%
                 September 1, 1998                5.34%
                 October 1, 1998                  4.88%
                 November 2, 1998                 5.24%
                 December 1, 1998                 5.03%

And, as this is being written in early March 1999, the 30-year bond has returned
to the level of August 1998.

These seemingly dry numbers tell a story that is filled with terror.  This was a
flight to quality and a flight away from  anything that smacked of risk. It is a
reminder  that  mutual  funds  are not  bank  accounts.  They  are  conduits  to
securities  markets,  and those markets must function every day. If the world is
in turmoil,  that  functioning will be rocky, but that does not mean all is bad.
If you owned  Russian  or  Brazilian  bonds it was bad.  But if you  owned  U.S.
Treasuries it was absolutely wonderful.

That is the great lesson here. A tumultuous  market produces  winners as well as
losers because money must flow somewhere. That's one reason we diversify. That's
one reason we don't pay much attention to doomsayers.

Sincerely,

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


For more complete  information about the mutual funds managed and distributed by
USAA Investment  Management  Company,  including charges and operating expenses,
please call for a prospectus. Read it carefully before investing.

Past performance is no guarantee of future results..








Investment Review

USAA MONEY MARKET FUND

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

TYPES OF  INVESTMENTS:  High-quality,  short-term  debt  securities that present
minimal credit risk.

- --------------------------------------------------------------------------------
                                            7/31/98              1/31/99
- --------------------------------------------------------------------------------
  Net Assets                           $2,491.5 Million     $2,808.5 Million
  Net Asset Value Per Share                 $1.00                 $1.00
- --------------------------------------------------------------------------------


- --------------------------------------------------------------------------------
AVERAGE ANNUAL TOTAL RETURNS AS OF 1/31/99
- --------------------------------------------------------------------------------
      7/31/98 to
        1/31/99       1 Year        5 Years      10 Years       7-day Yield
        2.55% (+)      5.28%         5.19%         5.51%           4.74%
- --------------------------------------------------------------------------------

(+) Total  returns  for periods of less than one year are not  annualized.  This
six-month  return is  cumulative.

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 a money market fund is not
insured or guaranteed by the FDIC or any other government  agency.  Although the
fund seeks to preserve the value of your  investment  at $1.00 per share,  it is
possible to lose money by investing in the fund. 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  IBC/Donoghue's  Money Fund
Averages (Trademark)/First Tier:

                    USAA Money
                    Market Fund                   IBC Average
                  -----------------               -----------
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%
08/25/98                5.26%                        4.91%
09/29/98                5.25%                        4.87%
10/27/98                5.02%                        4.64%
11/24/98                4.96%                        4.55%
12/29/98                4.99%                        4.52%
01/26/99                4.74%*                       4.37%*

Data represent the last Tuesday of each month.
*Ending date 1/26/99


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]

Globalization and  technological  advances continue to link almost all countries
in the world.  As worldwide  trading grows,  the U.S.  economy is subject to the
influences of economic and financial  events  occurring in countries  other than
our own.  Since our annual  report in July 1998,  the Federal  Reserve (Fed) has
lowered the Federal  Funds rate by .75%.  This was the first  change in interest
rate policy since the Federal  Reserve  increased  rates on March 25, 1997.  The
change in Fed  policy was  driven by the  impact on the U.S.  economy  caused by
financial instability in Russia, Asia, and Latin America.  Financial instability
in these regions may result in the slowing of demand for U.S.  goods  (exports).
By lowering  interest rates, the Fed is trying to stimulate our domestic economy
to offset the slowdown that may be caused by reduced trade with other countries.
We expect reports of economic data throughout 1999 to show further growth in the
U.S., offsetting any need for further interest rate reductions.

Since  our  July  annual  report,  we  have  reduced  some  of our  holdings  in
obligations  of money center banks that could have exposure to Russia,  Asia, or
Latin  America.  Instead,  we have been  purchasing  more  commercial  paper and
variable  rate  demand  notes  (VRDN) of domestic  corporations.  In view of the
events  cited  above,  we strive to  maintain a stable net asset  value of $1.00
while maximizing current income.

According to IBC  Financial  Data,  the USAA Money  Market Fund  continues to be
ranked highly among money market funds.  While past  performance is no guarantee
of future  results,  for the twelve  months ended  January 31,  1999,  your Fund
ranked 20 out of 268 retail Money Market funds.







                             PORTFOLIO RATINGS/MIX

A pie chart is shown here  depicting  the Portfolio Mix as of January 31, 1999
of the USAA Money Market Fund to be:

Bonds/Notes - 38.0%*;  Variable Rate Demand Notes - 23.0%*;  Commercial  Paper -
25.8%*; and CDs - 12.3%*.


* 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 01/31/89
through 01/31/99. The data points from the graph are as follows:


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

01/89           $10,000
07/89            10,453
01/90            10,888
07/90            11,313
01/91            11,750
07/91            12,110
01/92            12,435
07/92            12,681
01/93            12,889
07/93            13,082
01/94            13,275
07/94            13,507
01/95            13,849
07/95            14,249
01/96            14,649
07/96            15,020
01/97            15,409
07/97            15,813
01/98            16,243
07/98            16,675
01/99            17,100

Data from 1/31/89 through 1/31/99


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 a money market fund is not insured or  guaranteed  by the FDIC or
any other  government  agency.  Although the fund seeks to preserve the value of
your investment at $1.00 per share, it is possible to lose money by investing in
the fund.  For 7-day yield  information,  please refer to the Fund's  Investment
Review page.

See page 8 for a complete listing of the Portfolio of Investments.










USAA MONEY MARKET FUND
CATEGORIES AND DEFINITIONS
PORTFOLIO OF INVESTMENT IN SECURITIES

January 31, 1999
(Unaudited)

Fixed  Rate  Instruments  - consist  of bonds and notes.  The  interest  rate is
constant  to  maturity.  Prior to  maturity,  the market  price of a  fixed-rate
instrument generally varies inversely to the movement of interest rates.

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
of the security.

Variable  Rate Demand Notes (VRDN) - provide the right,  on any business day, to
sell the  security  at face  value on either  that day or  within  30 days.  The
interest rate is adjusted at a stipulated daily,  weekly, or monthly interval to
a rate that reflects  current market  conditions.  In bond funds,  the effective
maturity is the next put date.

Cash  Equivalents  -  consist  of  short-term   obligations   issued  by  banks,
corporations,  and U.S.  Government  Agencies.  The interest rate is constant to
maturity.

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

Credit  Enhancement  - add  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, or
other corporation, or a collateral trust.

     (LOC)   Enhanced by a bank letter of credit.
     (NBGA)  Enhanced by a non-bank guarantee agreement.
     (INS)   Scheduled principal and interest payments are insured by:
             (1) MBIA, Inc.






USAA MONEY MARKET FUND
PORTFOLIO OF INVESTMENTS
(IN THOUSANDS)

January 31, 1999
(Unaudited)

<TABLE>
<CAPTION>

 Principal                                          Coupon
  Amount    Security                                 Rate      Maturity    Value
- -------------------------------------------------------------------------------------
<C>         <S>                                      <C>      <C>         <C>
                  FIXED RATE INSTRUMENTS (42.6%)
            Banks - Major Regional
$  30,000   BankBoston Corp., CP                     5.06%    4/14/1999   $   29,688
   40,000   BankBoston Corp., CP                     4.88     4/20/1999       39,566
   25,000   BankBoston Corp., CP                     5.07     5/17/1999       24,623
   14,500   Mercantile Safe Deposit & Trust Co., CD  6.30     8/16/1999       14,540
   50,000   Merita Bank PLC, CD                      5.69     8/06/1999       49,988
   35,000   Merita N.A., Inc., CP                    4.99     4/08/1999       34,670
   18,108   Merita N.A., Inc., CP                    4.81     4/26/1999       17,900
   30,000   National Bank of Canada, CD              5.26     2/08/1999       30,000
   30,000   National Bank of Canada, CD              5.72     3/08/1999       29,999
- ---------------------------------------------------------------------------------------
                                                                             270,974
- ---------------------------------------------------------------------------------------
            Banks - Money Center
   25,000   Bankers Trust Co., CD                    5.76     4/26/1999       24,998
   25,000   Bankers Trust Co., CD                    5.70     7/23/1999       24,994
   35,000   Banque Nationale de Paris, CD            5.52     2/18/1999       34,997
   30,000   Commerzbank AG, CD                       5.52     2/02/1999       29,999
   30,000   Commerzbank AG, CD                       5.54     2/02/1999       30,000
   25,000   Credit Agricole Indosuez, CD             5.73     4/16/1999       24,998
   30,000   Deutsche Bank AG, CD                     5.70     3/30/1999       29,996
   30,000   Macquarie Bank Ltd., CP                  5.00     2/16/1999       29,929
   15,000   Macquarie Bank Ltd., CP                  5.00     2/17/1999       14,963
   25,000   Macquarie Bank Ltd., CP                  5.37     2/19/1999       24,925
   25,000   Paribas Finance, Inc. CP                 5.09     3/19/1999       24,830
   20,000   Societe Generale, CD                     5.70     8/03/1999       19,994
   25,000   Unibanco-Uniao de Bancos Brasilieros
             S.A., CP (LOC)                          5.45     6/28/1999       24,436
- ---------------------------------------------------------------------------------------
                                                                             339,059
- ---------------------------------------------------------------------------------------
            Electric/Gas Utilities - Municipal
   20,000   Cogentrix of Richmond, Inc., CP (LOC)    4.85     2/12/1999       19,965
   44,362   Cogentrix of Richmond, Inc., CP (LOC)    4.90     2/16/1999       44,259
   27,880   Nebraska Public Power District CP        5.04     4/28/1999       27,880
- ---------------------------------------------------------------------------------------
                                                                              92,104
- ---------------------------------------------------------------------------------------
            Finance - Consumer
   25,000   American Honda Finance Corp., CP         5.23     2/09/1999       24,964
   15,000   American Honda Finance Corp., CP         5.18     2/11/1999       14,974
   20,040   Associates Corp. of N.A., Senior Notes   6.00     3/15/1999       20,047
   18,465   Associates Corp. of N.A., Senior Notes   6.25     3/15/1999       18,477
   40,980   Countrywide Home Loans, Inc., CP         5.33     2/11/1999       40,907
   40,000   Countrywide Home Loans, Inc., CP         4.88     2/26/1999       39,854
   10,418   Ford Motor Credit Co. MTN                6.38     9/15/1999       10,459
   55,786   General Motors Acceptance Corp., CP      4.83     3/03/1999       55,547
   14,750   General Motors Acceptance Corp., MTN     5.45     3/01/1999       14,746
   46,739   Household Finance Corp. CP               4.83     2/01/1999       46,726
- ---------------------------------------------------------------------------------------
                                                                             286,701
- ---------------------------------------------------------------------------------------
            Finance - Diversified
   16,708   General Electric Capital Corp., CP       4.81     3/08/1999       16,626
   30,000   General Electric Capital Corp., CP       5.06     4/27/1999       29,633
   30,000   Heller Financial, Inc., CP               4.93     2/01/1999       29,992
   40,000   Heller Financial, Inc., CP               4.95     2/02/1999       39,983
- ---------------------------------------------------------------------------------------
                                                                             116,234
- ---------------------------------------------------------------------------------------
            Hospitals
   13,145   Bergen County, NJ, County Improvement
             Auth., Notes (NBGA)                     5.74     2/17/1999       13,145
- ---------------------------------------------------------------------------------------
            Natural Gas Utilities
   50,000   Northern Illinois Gas Co.                5.07     1/26/2000       50,000
- ---------------------------------------------------------------------------------------
            Retail - General Merchandising
   27,463   Sears Roebuck Acceptance Corp., CP       4.84     3/04/1999       27,341
- ---------------------------------------------------------------------------------------
            Total fixed rate instruments (cost: $1,195,558)                1,195,558
- ---------------------------------------------------------------------------------------

                  PUT BONDS (13.8%)
            Electric Utilities
   54,700   IDA of New Hampshire, Pollution Control
             RB, Series E (LOC)                      5.02     5/01/2021       54,700
   65,000   IDB of Columbia, AL, RB, Series 1997(a)  5.33    11/01/2021       65,000
- ---------------------------------------------------------------------------------------
                                                                             119,700
- ---------------------------------------------------------------------------------------
            Hospitals
   15,300   Metrocrest, TX, Hospital Auth. RB,
             Series 1989A (LOC)                      5.33     8/01/2008       15,293
- ---------------------------------------------------------------------------------------
            Leisure Time
    7,620   Sault Ste. Marie Tribe Building Auth.,
             RB, Series 1996B (LOC)                  5.55     6/01/2003        7,620
- ---------------------------------------------------------------------------------------
            Nursing/Continuing Care Centers
    7,000   Bexar County, TX, Health Facilities
             Development RB (LOC)                    5.95     2/01/2022        7,000
- ---------------------------------------------------------------------------------------
            Oil - Domestic Integrated
   26,200   Madison County, IL, RB, Series 1997A(a)  4.86    12/01/2037       26,200
- ---------------------------------------------------------------------------------------
            Oil & Gas - Refining/Manufacturing
   25,000   IDA of Gulf Coast RB, Series 1998 (LOC)  4.95     8/01/2028       25,000
   45,000   IDB of the Parish of Calcasieu, LA, Inc.
             Environmental RB, Series 1996 (LOC)     5.26     7/01/2026       45,000
   29,215   Port Arthur, TX Navigation District RB,
             Series 1998(a)                          5.20     6/01/2018       29,215
- ---------------------------------------------------------------------------------------
                                                                              99,215
- ---------------------------------------------------------------------------------------
            Paper & Forest Products
   22,000   IDA of Bedford County, VA, RB, Series
             1995B (LOC)                             5.25    12/01/2025       22,000
- ---------------------------------------------------------------------------------------
            Single-Family Housing
   25,000   Virginia Housing Development Auth.
             Mortgage Bonds                          5.05     4/01/2038       25,000
- ---------------------------------------------------------------------------------------
            Special Assessment/Tax/Fee
   65,900   Anaheim, CA, COP (LOC)                   5.28    12/01/2022       65,900
- ---------------------------------------------------------------------------------------
            Total put bonds (cost: $387,928)                                 387,928
- ---------------------------------------------------------------------------------------

                  VARIABLE RATE DEMAND NOTES (23.0%)
            Asset Backed Securities
   18,282   Capital One Funding Corp., Notes,
             Series 1995C (LOC)                      4.91    10/01/2015       18,282
   21,372   Capital One Funding Corp., Notes,
             Series 1996E (LOC)                      4.91     7/02/2018       21,372
- ---------------------------------------------------------------------------------------
                                                                              39,654
- ---------------------------------------------------------------------------------------
            Automobiles
    8,500   Columbus, GA Development Authority
             RB (LOC)                                4.96     9/01/2013        8,500
- ---------------------------------------------------------------------------------------
            Auto Parts
   14,400   Alabama IDA RB (Rehau Project) (LOC)     5.08    10/01/2019       14,400
    9,255   Bardstown, KY, RB, Series 1994 (LOC)     5.00     6/01/2024        9,255
   11,000   Bardstown, KY, RB, Series 1995 (LOC)     5.00     3/01/2025       11,000
- ---------------------------------------------------------------------------------------
                                                                              34,655
- ---------------------------------------------------------------------------------------
            Broadcasting - Radio & TV
   48,000   New Jersey Economic Development Auth.
             RB (NBGA)(a)                            5.04    10/01/2021       48,000
- ---------------------------------------------------------------------------------------
            Buildings
    7,400   San Bernardino County, CA, COP (LOC)     5.30    11/01/2025        7,400
- ---------------------------------------------------------------------------------------
            Chemicals
    8,455   Wyckoff Chemical Company, Inc., Note,
             Series 1997 (LOC)                       4.89     2/01/2027        8,455
- ---------------------------------------------------------------------------------------
            Electrical Equipment
   14,000   Mississippi Business Finance Corp.,
             Series 1998 (a)                         5.04     2/01/2023       14,000
- ---------------------------------------------------------------------------------------
            Finance - Diversified
   20,080   KBL Capital Fund, Inc., Installment #1
             Notes, Series A (LOC)                   4.89     5/01/2027       20,080
- ---------------------------------------------------------------------------------------
            General Obligations
   15,795   San Bernardino County, CA, COP, (Glen
             Helen Project), Series D (LOC)          5.19     3/01/2024       15,795
- ---------------------------------------------------------------------------------------
            Healthcare - Specialized Services
    6,700   Mason City Clinic, P.C., IA, Bonds,
             Series 1992 (LOC)                       5.05     9/01/2022        6,700
    9,045   Navigator Ventures, L.L.C., Notes,
             Series 1997 (LOC)                       4.89     5/01/2027        9,045
- ---------------------------------------------------------------------------------------
                                                                              15,745
- ---------------------------------------------------------------------------------------
            Hospitals
   20,000   Crouse Health Hospital, Inc., RB,
             Series 1996 (LOC)                       5.00     7/01/2017       20,000
   15,100   Dome Corp., Bonds, Series 1991 (LOC)     4.98     8/31/2016       15,100
- ---------------------------------------------------------------------------------------
                                                                              35,100
- ---------------------------------------------------------------------------------------
            Leisure Time
    9,000   Fox Valley Ice Arena, IL, RB, Series
             1997 (LOC)                              5.00     7/01/2027        9,000
   14,390   Greenville, SC Memorial Auditorium
             District Public Facilities COP, Series
             1996C (LOC)                             5.00     9/01/2014       14,390
- ---------------------------------------------------------------------------------------
                                                                              23,390
- ---------------------------------------------------------------------------------------
            Lodging/Hotel
   15,000   Central Michigan Inns RB (LOC)           4.98    11/01/2028       15,000
- ---------------------------------------------------------------------------------------
            Manufacturing - Specialized
   16,750   Loma Co. L.L.C. Floating Rate, Option
             Notes (LOC)                             4.91    12/01/2008       16,750
   13,000   Savannah, GA, Economic Development
             Auth., RB, Series 1998 (LOC)            4.97     6/01/2018       13,000
- ---------------------------------------------------------------------------------------
                                                                              29,750
- ---------------------------------------------------------------------------------------
            Multi-Family Housing
    6,150   Arbor Properties, Inc., Notes (LOC)      5.00     6/01/2022        6,150
- ---------------------------------------------------------------------------------------
            Nursing Care
    3,525   Grand Valley Atrium, Inc. Taxable RB,
             Series 1998 (LOC)                       5.01     6/01/2018        3,525
- ---------------------------------------------------------------------------------------
            Nursing/Continuing Care Centers
    7,900   Assisted Living Funding L.L.C., Bonds,
             Series 1997 (LOC)                       5.20    10/01/2017        7,900
   31,200   Lincolnwood Funding Corp. RB,
             Series 1995A (LOC)                      4.98     8/01/2015       31,200
   10,350   Missouri Health and Educational
             Facilities Auth. RB, Series 1996B (LOC) 5.05    12/01/2016       10,350
- ---------------------------------------------------------------------------------------
                                                                              49,450
- ---------------------------------------------------------------------------------------
            Paper & Forest Products
   17,000   Bancroft Bag, Inc. Notes (LOC)           4.91    10/01/2008       17,000
   10,030   Mac Papers Inc., Demand Bond (LOC)       4.95     8/03/2015       10,030
   10,000   Tim Bar Corp. RB (LOC)                   5.00     9/01/2010       10,000
- ---------------------------------------------------------------------------------------
                                                                              37,030
- ---------------------------------------------------------------------------------------
            Real Estate - Other
   22,400   Chestnut Partnership Bond (LOC)          5.05     1/01/2029       22,400
    5,974   Erie Funding I, Notes (LOC)              4.97    11/01/2016        5,974
   15,500   First Illinois Funding Corp. Project,
             RB, Series 1996 (LOC)                   5.00     9/01/2026       15,500
   15,805   H/M Partners, L.L.C., Bond (LOC)         5.00    10/01/2020       15,805
   14,220   HGR-1, L.L.C., Notes, Series 1996 (LOC)  4.98     9/15/2046       14,220
   11,480   Houston County, GA, IDA, RB (LOC)        5.00     8/01/2012       11,480
   24,315   LAM Funding L.L.C., Notes, Series A
             (LOC)                                   4.89    12/15/2027       24,315
   24,510   Mayfair At Great Neck, NY Bonds (LOC)    5.21     1/01/2023       24,510
   10,715   Physicians Real Estate, L.L.P., Notes,
             Series 1998 (LOC)                       5.05     2/01/2018       10,715
   10,085   Pierce Memorial Baptist Home, Inc.,
             Series 1999 (LOC)                       5.05    10/01/2028       10,085
    6,850   PRA at Glenwood Hills Corporate Centre,
             L.L.C., Notes, Series 1997 (LOC)        4.89     8/01/2027        6,850
   14,365   Sbar Piperno Co., Series 1998 (LOC)      4.95     9/01/2012       14,365
    9,260   Shepherd Capital, L.L.C., Notes, Series
             1997 (LOC)                              4.98     7/15/2047        9,260
- ---------------------------------------------------------------------------------------
                                                                             185,479
- ---------------------------------------------------------------------------------------
            Special Assessment/Tax/Fee
   20,600   County of Cuyahoga, OH, RB, Series
             1992B (LOC)                             4.91     6/01/2022       20,600
- ---------------------------------------------------------------------------------------
            Textiles - Home Furnishings
   10,000   Alabama IDA RB (Fieldcrest Project)
             (LOC)                                   5.00     7/01/2021       10,000
- ---------------------------------------------------------------------------------------
            Water/Sewer Utilities - Municipal
   18,040   Hesperia, CA, Public Financing Auth. RB,
             Series 1998A (LOC)                      5.30     6/01/2026       18,040
- ---------------------------------------------------------------------------------------
            Total variable rate demand notes (cost: $645,798)                645,798
- ---------------------------------------------------------------------------------------

                  ADJUSTABLE RATE NOTES (19.7%)
            Banks - Major Regional
   25,000   BankBoston N.A. Bank Notes               5.28    11/02/1999       25,000
   40,000   Comerica Bank, MTN                       5.11     6/10/1999       39,990
   20,290   Long Lane Master Trust, Notes, Series
             1998B (a),(b)                           4.98     4/30/1999       20,290
   19,800   Long Lane Master Trust, Notes, Series
             1999A (a),(b)                           5.13     1/20/2000       19,800
- ---------------------------------------------------------------------------------------
                                                                             105,080
- ---------------------------------------------------------------------------------------
            Banks - Money Center
   40,000   Bankers Trust, NY, Corp. Notes (a)       4.97     2/10/1999       40,000
   30,000   Bankers Trust, NY, Corp. Notes (a)       5.38     2/19/1999       30,000
- ---------------------------------------------------------------------------------------
                                                                              70,000
- ---------------------------------------------------------------------------------------
            Finance - Consumer
   40,000   American Honda Finance Corp., MTN (a)    5.38     8/16/1999       39,998
   30,000   American Honda Finance Corp., MTN (a)    5.03     4/09/1999       30,000
   50,000   Chrysler Financial Corp., MTN, Series Q  4.96     2/03/1999       50,000
   25,000   Household Finance Corp., MTN             5.19     3/09/1999       25,000
   25,000   Household Finance Corp., MTN             4.92     4/30/1999       25,000
   40,000   Toyota Motor Credit Corp., MTN           5.01    10/19/1999       40,011
- ---------------------------------------------------------------------------------------
                                                                             210,009
- ---------------------------------------------------------------------------------------
            Finance - Diversified
   25,000   General Electric Capital Corp., MTN      5.09     6/08/1999       24,996
   50,000   Sanwa Business Credit Corp., MTN
             (INS) (1),(a)                           5.19     5/20/1999       49,998
- ---------------------------------------------------------------------------------------
                                                                              74,994
- ---------------------------------------------------------------------------------------
            Leasing
   50,000   PHH Corp., MTN                           5.00     2/05/1999       50,000
   45,000   PHH Corp., MTN                           5.07     7/12/1999       44,998
- ---------------------------------------------------------------------------------------
                                                                              94,998
- ---------------------------------------------------------------------------------------
            Total adjustable rate notes (cost: $555,081)                     555,081
- ---------------------------------------------------------------------------------------
            Total investments (cost: $2,784,365)                          $2,784,365
=======================================================================================
</TABLE>



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

     Finance - Consumer                         17.7%
     Banks - Money Center                       14.6
     Banks - Major Regional                     13.4
     Finance - Diversified                       7.5
     Real Estate - Other                         6.6
     Electric Utilities                          4.3
     Oil & Gas - Refining/Manufacturing          3.5
     Leasing                                     3.4
     Electric/Gas Utilities - Municipal          3.3
     Special Assessment/Tax/Fee                  3.1
     Hospitals                                   2.3
     Paper & Forest Products                     2.1
     Nursing/Continuing Care Centers             2.0
     Natural Gas Utilities                       1.8
     Broadcasting - Radio & TV                   1.7
     Asset Backed Securities                     1.4
     Auto Parts                                  1.2
     Leisure Time                                1.1
     Manufacturing - Specialized                 1.1
     Retail - General Merchandising              1.0
     Other                                       6.0
                                                ------
                                                99.1%
                                                ======  







USAA MONEY MARKET FUND
NOTES TO PORTFOLIO OF INVESTMENTS

January 31, 1999
(Unaudited)


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 15.1% of net assets at January
31, 1999.


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 January 31,
1999, these securities represented 1.4% of the net assets.


See accompanying notes to financial statements.








USAA MONEY MARKET FUND
STATEMENT OF ASSETS AND LIABILITIES
(IN THOUSANDS)

January 31, 1999
(Unaudited)


ASSETS
   Investments in securities                                        $ 2,784,365
   Cash                                                                   9,408
   Receivables:
      Capital shares sold                                                 6,020
      Interest                                                           26,826
      Securities sold                                                     1,300
                                                                    ------------
         Total assets                                                 2,827,919
                                                                    ------------
LIABILITIES
   Securities purchased                                                   2,500
   Capital shares redeemed                                               15,610
   USAA Investment Management Company                                       228
   USAA Transfer Agency Company                                             421
   Accounts payable and accrued expenses                                    414
   Dividends on capital shares                                              249
                                                                    ------------
         Total liabilities                                               19,422
                                                                    ------------
            Net assets applicable to capital shares outstanding     $ 2,808,497
                                                                    ============

REPRESENTED BY:
   Paid-in capital                                                  $ 2,808,497
                                                                    ============
   Capital shares outstanding                                         2,808,497
                                                                    ============
   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)

Six-month period ended January 31,1999
(Unaudited)


Net investment income:
   Interest income                                                  $    73,029
                                                                    ------------
   Expenses:
      Management fees                                                     3,119
      Transfer agent's fees                                               2,231
      Custodian's fees                                                      346
      Postage                                                               227
      Shareholder reporting fees                                            131
      Directors' fees                                                         2
      Registration fees                                                     201
      Professional fees                                                      22
      Other                                                                  23
                                                                    ------------
         Total expenses before reimbursement                              6,302
      Expenses reimbursed                                                  (338)
                                                                    ------------
         Total expenses after reimbursement                               5,964
                                                                    ------------
            Net investment income                                   $    67,065
                                                                    ============

See accompanying notes to financial statements.












USAA MONEY MARKET FUND
STATEMENTS OF CHANGES IN NET ASSETS
(IN THOUSANDS)

Six-month period ended January 31, 1999
and Year ended July 31, 1998
(Unaudited)

                                                       1/31/99        7/31/98
                                               ---------------------------------
From operations:
   Net investment income                           $    67,065      $   122,339
                                               ---------------------------------
Distributions to shareholders from:
   Net investment income                               (67,065)        (122,339)
                                               ---------------------------------
From capital share transactions:
   Proceeds from shares sold                         2,180,203        3,370,264
   Shares issued for dividends reinvested               64,794          118,246
   Cost of shares redeemed                          (1,927,973)      (3,158,728)
                                               ---------------------------------
      Increase in net assets from capital
       share transactions                              317,024          329,782
                                               ---------------------------------
Net increase in net assets                             317,024          329,782
Net assets:
   Beginning of period                               2,491,473        2,161,691
                                               ---------------------------------
   End of period                                   $ 2,808,497      $ 2,491,473
                                               =================================
Change in shares outstanding:
   Shares sold                                       2,180,203        3,370,264
   Shares issued for dividends reinvested               64,794          118,246
   Shares redeemed                                  (1,927,973)      (3,158,728)
                                               ---------------------------------
      Increase in shares outstanding                   317,024          329,782
                                               =================================

See accompanying notes to financial statements.






USAA MONEY MARKET FUND
NOTES TO FINANCIAL STATEMENTS

January 31, 1999
(Unaudited)


(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 three joint short-term  revolving
loan  agreements  totaling  $850  million,  two with  USAA  Capital  Corporation
(CAPCO),  an affiliate of the Manager ($250  million  committed and $500 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 the CAPCO agreements,
the Fund may borrow from CAPCO an amount under both agreements combined of 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   agreements,   does  not  exceed  25%  of  the  Fund's  total  assets  at
NationsBank's borrowing rate plus a markup. The Fund had no borrowings under any
of these agreements during the six-month period ended January 31, 1999.


(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
six-month  period  ended  January 31, 1999 were $9.0  billion and $8.7  billion,
respectively.


(5) TRANSACTIONS WITH MANAGER
A. Management fees - USAA Investment  Management  Company carries out the Fund's
investment policies and manages the Fund's portfolio. 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  six-month  period ended  January 31, 1999  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 $28.50 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 January 31, 1999, the  Association and its affiliates
owned 1.6 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.


(7) YEAR 2000
Like other mutual  funds,  the Fund could be adversely  affected if the computer
systems used by the Manager and the Fund's other service  providers are not able
to perform  their  intended  functions  effectively  after  1999  because of the
inability of computer  software to distinguish the year 2000 from the year 1900.
The Manager is taking  steps to address  this  potential  year 2000 problem with
respect  to the  computer  systems  that  they  use and to  obtain  satisfactory
assurances  that  comparable  steps are being  taken by the Fund's  other  major
service providers.  At this time, however,  there can be no assurance that these
steps  will be  sufficient  to avoid  any  adverse  impact to the Fund from this
problem.


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

<TABLE>
<CAPTION>
                             Six-month                                                        Ten-month
                            Period Ended                                                     Period Ended
                             January 31,              Year Ended July 31,                      July 31,
                           -------------------------------------------------------------------------------
                                1999         1998         1997         1996         1995         1994
                           -------------------------------------------------------------------------------
<S>                         <C>          <C>          <C>          <C>          <C>          <C>
Net asset value at
   beginning of period      $     1.00   $     1.00   $     1.00   $     1.00   $     1.00   $     1.00
Net investment income              .03          .05          .05          .05          .05          .03
Distributions from net
   investment income              (.03)        (.05)        (.05)        (.05)        (.05)        (.03)
                           -------------------------------------------------------------------------------
Net asset value at
   end of period            $     1.00   $     1.00   $     1.00   $     1.00   $     1.00   $     1.00
                           ===============================================================================
Total return (%) *                2.55         5.45         5.28         5.41         5.49         2.74
Net assets at
   end of period (000)      $2,808,497   $2,491,473   $2,161,691   $1,829,749   $1,540,055   $1,006,020
Ratio of expenses to
   average net assets (%)          .45(a)       .45          .45          .45          .45          .46(a)
Ratio of expenses to
   average net assets
   excluding
   reimbursement (%)               .47(a)       .48          .49          .51          .46           -
Ratio of net investment
   income to average net
   assets (%)                     5.00(a)      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 7:30 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 USAA TouchLine(Service Mark)
(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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