USAA MUTUAL FUND INC
N-30D, 1998-03-25
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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:
    Statement of Assets and Liabilities                           7
    Portfolio of Investments in Securities                        8
    Notes to Portfolio of Investments in Securities              16
    Statement of Operations                                      17
    Statements of Changes in Net Assets                          18
    Notes to Financial Statements                                19

===============================================================================


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 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 offered by USAA Investment  Management Company
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]

"We are now ready to 
move to another plateau."  

Back in 1980 we began to craft a family  of mutual  funds  that  would  allow an
investor to create a diversified  portfolio  suited to an individual's  appetite
for risk. In 1984 we started a brokerage service because we thought some members
might want that.  The two have grown  beyond  our  dreams.  Our fund  family now
offers  35  investment  choices  and our  Brokerage  Service  has  become a very
significant  presence  in its  industry.  We are now  ready  to move to  another
plateau.

As I write  this  message,  the USAA  Investment  Management  Company  is in the
process  of  ending  our  long  and  mutually  rewarding  relationship  with BHC
Securities,  and taking on all of the  responsibilities of running our Brokerage
Service.  The term for this is  "self-clearing." It includes our own seat on the
Chicago Stock Exchange.  Shortly after we achieve  self-clearing,  we shall also
move our mutual fund accounts off of an internal  system and onto the facilities
of DST Systems,  a Kansas City company  that  processes  very much of the mutual
fund industry's  transactions.  These two moves will greatly improve our ability
to offer you better service.

Our goal is to give you a single  investment  account which can hold,  track and
report to you on almost any type of  investment  you wish to make. It will offer
features such as low-cost loans based upon your investments,(1) easy movement of
funds,(2)  and a single  statement.  It will also be tied to other USAA services
such as banking, fixed and variable annuities and property and casualty and life
insurance.  We will make this the only investment  account you will need. You'll
be hearing more on this in coming months.

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  (IMCO),  including  charges and expenses,
please call for a prospectus. Read it carefully before you invest.

USAA Brokerage  Services is a discount  brokerage service of USAA IMCO, a member
of the NASD.

(1) Margin  borrowing allows you to buy securities using funds that we will loan
    you for payment.  It can serve as a low-interest  loan which can be used for
    any purpose. Not all securities can be margined,  however.  Margin borrowing
    involves additional risks.
(2) An investor should consider the fluctuating values of securities.




Investment Review

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                  1/31/98
===============================================================================
  Net Assets                      $2,161.7 Million         $2,290.8 Million
  Net Asset Value Per Share            $1.00                    $1.00
===============================================================================
                                                              

AVERAGE ANNUAL TOTAL RETURNS AND CURRENT YIELD AS OF 1/31/98
===============================================================================
  7/31/97 to 1/31/98      1 Year      5 Years      10 Years      7-day Yield
        2.72%(+)           5.41%       4.73%         5.73%          5.39%
===============================================================================
(+) 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 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 GRAPH 
- -----------------------------

A chart in the form of a line graph appears here, illustrating the comparison of
a 7-day  yield of the USAA Money  Market Fund to the  IBC/Donoghue's  Money Fund
Averages(TM)/First Tier from 01/28/97 to 01/27/98.

                                            IBC/DONOGHUE'S MONEY
                    USAA MONEY               FUND AVERAGES(TM)/
                    MARKET FUND                 FIRST TIER  
                    -----------                 ----------
2/25/97                5.13%                       4.73%
3/25/97                5.12%                       4.74%
4/29/97                5.25%                       4.89%
5/27/97                5.30%                       4.93%
6/24/97                5.34%                       4.94%
7/29/97                5.31%                       4.93%
8/26/97                5.28%                       4.93%
9/30/97                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%
1/27/98                5.39%*                      4.99%*


Data represent the last Tuesday of each month.

*Ending date 1/27/98

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



                           Message from the Manager

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


A LOOK BACK
With the onset of the first  money  market  fund  launched  in 1971,  individual
investors  were able to participate in higher  yielding  short-term  instruments
previously available only to institutional  investors.  Over the next ten years,
money market fund assets  increased  more than $100 billion as inflation  caused
interest rates to skyrocket to near 20% levels in the early 1980s.  Cash quickly
left lower  yielding bank deposits and poured into money market funds.  The 1982
deregulation  of the  banking  industry  allowed  banks to create  money  market
deposit  accounts that could pay higher rates over passbook savings accounts and
therefore  compete against money market mutual funds for assets. By 1990, assets
of money market funds exceeded $500 billion even as the country was in the midst
of a recession.  Since then,  assets have  continued to grow,  surpassing the $1
trillion mark in August 1997.

Regulation  has changed the way money  market funds are  managed.  In 1983,  the
Securities and Exchange  Commission  adopted Rule 2a-7 of the Investment Company
Act of 1940 to reduce the  likelihood  of deviation of a money market fund's net
asset value from $1.00.  The "Rule" and its amendments  (adopted in 1986,  1991,
and 1998) dictate the purchase of high quality securities and limit the weighted
average  maturity of a money market  fund.  An impact of this  regulation  is an
extremely competitive money market industry.

CURRENT MARKET CONDITIONS
With the Federal  Reserve  interest rate policy  unchanged since March 1997, the
money market arena has been  uneventful.  Financial  markets have focused on the
crises  in Asia and the  impact it may have on the U.S.  economy.  Growth in the
U.S. is expected to slow during 1998, but the economic expansion we have enjoyed
since 1991 should continue.

For the twelve months ended January 31, 1998, the USAA Money Market Fund's total
return ranked 16 out of 257 funds in the U.S. Money Market category according to
IBC/Donoghue's Money Fund Vision Report. At the close of business on January 30,
1998, the average 7-day yield for other money market funds was 4.95% compared to
the Fund's yield of 5.39%.



                           PORTFOLIO MIX

A pie chart appears here depicting the Portfolio Mix as of 1/31/98 of the USAA
Money Market Fund to be:
Commercial Paper - 14.9%*, CDs - 16.4%*, Variable Rate Demand Notes - 22.3%*,
Bonds/Notes - 47.6%*.

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



- ----------------------------------
CUMULATIVE PERFORMANCE OF $10,000
- ----------------------------------

A chart in the form of a line graph appears here,  illustrating  the  cumulative
performance of a $10,000 investment in the USAA Money Market Fund for the period
of 1/31/88 to 1/31/98. The data points from the graph are as follows:


1/31/88          10,000
6/88             10,269
12/88            10,669
06/89            11,151
12/89            11,622
06/90            12,075
12/90            12,548
6/91             12,946
12/91            13,310
06/92            13,585
12/92            13,815
06/93            14,025
12/93            14,231
6/94             14,468
12/94            14,807
6/95             15,239
12/95            15,666
6/96             16,067
12/96            16,487
06/97            16,916
12/97            17,377
1/31/98          17,454

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 in Securities.



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

January 31, 1998
(Unaudited)

ASSETS
   Investments in securities                                        $2,318,656
   Cash                                                                 13,709
   Receivables:
      Capital shares sold                                                6,347
      Interest                                                          21,197
                                                                    ----------
         Total assets                                                2,359,909
                                                                    ----------


LIABILITIES
   Securities purchased                                                 57,115
   Capital shares redeemed                                              10,328
   USAA Investment Management Company                                      691
   USAA Transfer Agency Company                                            337
   Accounts payable and accrued expenses                                   316
   Dividends on capital shares                                             278
                                                                    ----------
         Total liabilities                                              69,065
                                                                    ----------
            Net assets applicable to capital shares outstanding     $2,290,844
                                                                    ==========


REPRESENTED BY:
   Paid-in capital                                                  $2,290,844
                                                                    ==========
   Capital shares outstanding                                        2,290,844
                                                                    ==========
   Net asset value, redemption price, and offering price per share  $     1.00
                                                                    ==========

See accompanying notes to financial statements.



CATEGORIES AND DEFINITIONS
PORTFOLIO OF INVESTMENT IN SECURITIES

January 31, 1998
(Unaudited)


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 VRDN's effective maturity is
the date on which the underlying  principal  amount may be recovered or the next
rate adjustment date consistent with regulatory requirements. Most VRDNs possess
a credit enhancement.

Variable  Rate  Notes - similar to VRDNs in the fact that the  interest  rate is
adjusted  periodically  to reflect  current market  conditions.  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, or
other  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.

PORTFOLIO DESCRIPTION  ABBREVIATIONS  
    BA   Bankers  Acceptance  
    CD   Certificate  of Deposit 
    COP  Certificate of Participation 
    CP   Commercial Paper 
    CRE  Credit Enhanced 
    DEB  Debentures
    IDA  Industrial Development Authority/Agency
    IDB  Industrial Development Board
    MTN  Medium-Term Note
    RB   Revenue Bond




MONEY MARKET FUND
PORTFOLIO OF INVESTMENTS IN SECURITIES
(IN THOUSANDS)

January 31, 1998
(Unaudited)


  Principal                                    Coupon
   Amount              Security                 Rate    Maturity     Value
   ------              --------                 ----    --------     -----

                         FIXED RATE INSTRUMENTS (40.6%)
            Auto Parts
$  23,000   Bridgestone/Firestone Inc., CP (CRE)5.75%   2/02/98   $ 22,992
- --------------------------------------------------------------------------

            Banks - Major Regional
   30,000   Bank of America National Trust and
             Savings Assn., Bank Notes          5.52    4/27/98      30,001
   25,000   BankBoston N. A., Bank Notes        5.80    4/24/98      25,000
   11,400   Barnett Bank, Inc., MTN             6.25    7/28/98      11,421
   20,000   First National Bank of Boston, 
             Bank Notes                         6.28    4/08/98      20,000
   25,000   Huntington National Bank, MTN       5.80    9/22/98      24,992
   25,000   National Bank of Canada, CD         6.00    3/06/98      25,000
   15,000   National Bank of Canada, CD         5.99    3/16/98      15,000
   17,000   Norwest Corp. MTN, Series G         6.00   10/13/98      17,008
- ---------------------------------------------------------------------------
                                                                    168,422
- ---------------------------------------------------------------------------

            Banks - Money Center
   20,000   Bankers Trust Co., CD               6.16    6/02/98      19,998
   25,000   Banque Nationale de Paris, CD       5.75    2/26/98      24,999
   30,000   Banque Nationale de Paris, CD       5.89   10/15/98      29,990
   25,000   Banque Paribas, CD                  5.53    4/27/98      24,999
   25,000   Barclays Bank PLC, CD               5.94    6/30/98      24,992
   25,000   Canadian Imperial Bank of 
             Commerce, CD                       5.69    3/02/98      25,000
   25,000   Canadian Imperial Bank of
             Commerce, CD                       5.82    9/30/98      24,987
   40,000   First Tennessee Bank, CD            5.50    4/15/98      39,996
    5,600   Sanwa Bank Ltd., BA                 6.11    2/17/98       5,584
   15,000   Sanwa Bank Ltd., BA                 6.11    2/18/98      14,954
   25,000   Sanwa Bank Ltd., CD                 6.18    2/18/98      25,000
   25,000   Societe Generale, CD                5.88    8/07/98      24,994
   30,000   Societe Generale, CD                5.95    8/28/98      29,991
   15,000   Societe Generale, CD                5.90   10/20/98      14,988
   25,000   Standard Charter Bank PLC, CD       5.79    4/23/98      25,001
   35,000   Unifunding, Inc., CP                5.47    2/13/98      34,931
- ---------------------------------------------------------------------------
                                                                    390,404
- ---------------------------------------------------------------------------
 
           Electric
    8,000  Florida Power & Light Co., MTN,
            Series 1993B                        5.50    3/11/98       7,998
   20,500  National Rural Utilities Corp.,
            MTN, Series C                       6.37   12/15/98      20,581
- ---------------------------------------------------------------------------
                                                                     28,579
- ---------------------------------------------------------------------------

            Electric/Gas Utilities
   24,418   Cogentrix of Richmond, Inc.,
             CP (CRE)                           5.48    2/17/98      24,355
   27,291   Cogentrix of Richmond, Inc.,
             CP (CRE)                           5.49    2/19/98      27,212
- ---------------------------------------------------------------------------
                                                                     51,567
- ---------------------------------------------------------------------------

            Finance - Consumer
   30,000   Aristar, Inc., CP                   5.54    2/10/98      29,954
   35,000   Aristar, Inc., CP                   5.55    2/25/98      34,865
    5,000   Chrysler Financial Corp., MTN       6.82    5/26/98       5,015
   16,320   Commercial Credit Corp., 
             Senior Notes                       8.50    2/15/98      16,337
   12,709   Ford Motor Credit Co. Global
             Notes                              5.63   12/15/98      12,680
   35,000   General Motors Acceptance Corp.,
             CP                                 5.50    2/05/98      34,973
   25,000   Yamaha Motor Finance Corp., CP 
             (CRE)                              5.78    2/17/98      24,932
- ---------------------------------------------------------------------------
                                                                    158,756
- ---------------------------------------------------------------------------

            Finance - Diversified
   56,584   General Electric Capital Corp., CP  5.62    2/02/98      56,566
   14,863   General Electric Capital Corp., CP  5.57    2/05/98      14,852
   27,430   General Electric Capital Corp., CP  5.62    2/11/98      27,383
- ---------------------------------------------------------------------------
                                                                     98,801
- ---------------------------------------------------------------------------

            Healthcare - Miscellaneous
    9,900   Medical Building Funding V LLC, CP,
             Series 1994 (CRE)                  5.85    2/05/98       9,892
- ---------------------------------------------------------------------------
            Total fixed rate instruments (cost: $929,413)           929,413
- ---------------------------------------------------------------------------

                                PUT BONDS (18.2%)
            Broadcasting - Radio & TV
   28,700   New Jersey Economic Development
             Auth. RB (CRE)                     5.72   10/01/21      28,700(a)
- ---------------------------------------------------------------------------

            Education
   47,235   DeKalb County, GA, IDA RB, 
             Series 1994B                       5.85   10/01/24      47,235
- ---------------------------------------------------------------------------

            Electric
   54,700   IDA of New Hampshire, Pollution Control RB,
             Series E (CRE)                     5.85    5/01/21      54,700
   55,000   IDB of Columbia, AL, RB,
             Series 1997                        5.90   11/01/21      55,000(a)
- --------------------------------------------------------------------------- 
                                                                    109,700
- ---------------------------------------------------------------------------

            General Obligations
   39,200   Cleveland, OH, Taxable Notes,
             Series 1994 (CRE)                  5.61    5/15/24      39,200
- ---------------------------------------------------------------------------

            Healthcare - Specialized Services
   25,350   Central Plains Clinic Ltd. RB,
             Series 1996 (CRE)                  5.58    9/01/17      25,350
   14,150   Central Plains Clinic Ltd. RB,
             Series 1997 (CRE)                  5.58   10/16/17      14,150
- ---------------------------------------------------------------------------
                                                                     39,500
- ---------------------------------------------------------------------------

            Leisure Time
    9,360   Sault Ste. Marie Tribe Building Auth., RB,
             Series 1996B (CRE)                 6.31    6/01/03       9,360
- ---------------------------------------------------------------------------

            Nursing / Continuing Care Centers
    7,000   Bexar County, TX, Health Facilities
             Development RB (CRE)               5.95    2/01/22       7,000
    7,000   Bexar County, TX, Health Facilities
             Development RB (CRE)               5.98    2/01/22       7,000
- ---------------------------------------------------------------------------
                                                                     14,000
- ---------------------------------------------------------------------------

            Oil - Domestic Integrated
   45,000   Madison County, IL, RB, 
             Series 1997A                       5.86   12/01/37      45,000(a)
- ---------------------------------------------------------------------------

            Oil - International Integrated
   18,660   Lower Neches Valley Auth., TX, RB,
             Series 1995A                       5.55    5/01/30      18,660
- ---------------------------------------------------------------------------

            Oil & Gas -  Refining/Manufacturing  
   39,000   IDB  of the  Parish  of  Calcasieu, 
             LA, Inc. Environmental RB, 
              Series 1996 (CRE)                 5.86    7/01/26      39,000
- ---------------------------------------------------------------------------

            Paper & Forest Products
   10,000   IDA of Bedford County, VA, RB,
             Series 1995B (CRE)                 5.90   12/01/25      10,000
   18,000   IDA of Bedford County, VA, RB,
             Series 1995C (CRE)                 5.90   12/01/25      18,000
- ---------------------------------------------------------------------------
                                                                     28,000
- ---------------------------------------------------------------------------
            Total put bonds (cost: $418,355)                        418,355
- ---------------------------------------------------------------------------


                  VARIABLE RATE DEMAND NOTES (22.3%)
            Appropriated Debt
   10,000   City of Gardena, CA, COP, 
             Series 1995 (CRE)                  6.15   7/01/25       10,000
    9,135   City of Gardena, CA, COP, 
             Series 1996 (CRE)                  6.15  11/01/19        9,135
- ---------------------------------------------------------------------------
                                                                     19,135
- ---------------------------------------------------------------------------

            Asset Backed Securities
    8,885   Capital One Funding Corp., Notes,
             Series 1993A (CRE)                 5.56   6/02/08        8,885
   20,072   Capital One Funding Corp., Notes,
             Series 1995C (CRE)                 5.56   10/01/15      20,072
   22,503   Capital One Funding Corp., Notes,
             Series 1996E (CRE)                 5.56    7/02/18      22,503
- ---------------------------------------------------------------------------
                                                                     51,460
- ---------------------------------------------------------------------------

            Auto Parts
   14,800   Alabama IDA RB (Rehau Project) (CRE)5.64   10/01/19      14,800
    9,255   Bardstown, KY, RB, Series 1994 (CRE)5.61    6/01/24       9,255
   11,000   Bardstown, KY, RB, Series 1995 (CRE)5.61    3/01/25      11,000
- ---------------------------------------------------------------------------
                                                                     35,055
- ---------------------------------------------------------------------------

            Building Material Group
    7,400   San Bernardino County, CA, COP (CRE)6.00   11/01/25       7,400
- ---------------------------------------------------------------------------

            Chemicals
    9,735   Wyckoff Chemical Company, Inc.,
             Demand Note, Series 1997 (CRE)     5.60    2/01/27      9,735
- --------------------------------------------------------------------------

            Community Service
   10,000   San Jose, CA, Financing Auth. RB,
             Taxable Series A (CRE)             5.85   12/01/25     10,000
- --------------------------------------------------------------------------

            Finance - Diversified
   21,800   KBL Capital Fund, Inc., Installment #1 Notes,
             Series A (CRE)                     5.60    5/01/27     21,800
- --------------------------------------------------------------------------

            General Obligations
   16,045   San Bernardino County, CA, COP,
             Glen Helen Project, 
              Series D (CRE)                    5.88    3/01/24     16,045
- --------------------------------------------------------------------------

            Healthcare - Diversified
   27,750   Wenatchee Valley Clinic, P.S., WA,
             Taxable Bonds, Series 1996 (CRE)   5.59   11/12/17     27,750
- --------------------------------------------------------------------------

            Healthcare - Specialized Services
    6,900   Mason City Clinic, P.C., IA, Bonds,
             Series 1992 (CRE)                  5.68    9/01/22      6,900
    9,260   Navigator Ventures, LLC, Notes,
             Series 1997 (CRE)                  5.60    5/01/27      9,260
- --------------------------------------------------------------------------
                                                                    16,160
- --------------------------------------------------------------------------

            Hospitals
   20,000   Crouse Health Hospital, Inc. RB,
             Series 1996 (CRE)                  5.70    7/01/17     20,000
   15,800   Dome Corp., Bonds, Series 
             1991 (CRE)                         5.67    8/31/16     15,800
- --------------------------------------------------------------------------
                                                                    35,800
- --------------------------------------------------------------------------

            Leisure Time
   10,500   BSL Golf of California, Inc., 
             RB (CRE)                           5.77    1/01/23     10,500
    9,000   Fox Valley Ice Arena, IL, Taxable 
             RB, Series 1997 (CRE)              5.75    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
- --------------------------------------------------------------------------
                                                                    33,890
- --------------------------------------------------------------------------

            Machinery - Diversified
   23,800   DSL Funding Corp., Notes (CRE)      5.71   12/01/09     23,800
- --------------------------------------------------------------------------

            Multi-family Housing
   12,155   Arbor Properties, Inc., Notes (CRE) 5.85   11/01/21     12,155
    6,225   Arbor Properties, Inc., Notes (CRE) 5.85    6/01/22      6,225
- --------------------------------------------------------------------------
                                                                    18,380
- --------------------------------------------------------------------------

            Nursing / Continuing Care Centers
    9,200   Assisted Living Funding LLC, Bonds,
             Series 1997 (CRE)                  5.65   10/01/17      9,200
   32,600   Lincolnwood Funding Corp. RB,
             Series 1995A (CRE)                 5.67    8/01/15     32,600
   10,575   Missouri Health and Educational
             Facilities Auth. RB, Series
             1996B (CRE)                        5.70   12/01/16     10,575
- --------------------------------------------------------------------------
                                                                    52,375
- --------------------------------------------------------------------------

            Real Estate - Other
   16,275   First Illinois Funding Corp. Project, RB,
             Series 1996 (CRE)                  5.75    9/01/26     16,275
   17,200   H/M Partners, LLC, Bond (CRE)       5.85   10/01/20     17,200
   13,945   HGR-1, LLC, Notes, Series 1996 
             (CRE)                              5.59    9/15/46     13,945
   12,000   Houston County, GA, Development
             Authority Industrial RB (CRE)      5.68    8/01/12     12,000
   25,000   LAM Funding LLC, Notes, Series A 
             (CRE)                              5.60   12/15/27     25,000
    7,000   PRA at Glenwood Hills Corporate
             Centre, LLC, Notes, Series 1997
              (CRE)                             5.60    8/01/27      7,000
    9,260   Shepherd Capital, LLC, Taxable 
             Notes, Series 1997 (CRE)           5.59    7/15/47      9,260
- --------------------------------------------------------------------------
                                                                   100,680
- --------------------------------------------------------------------------

            Special Assessment/Tax/Fee
   21,500   County of Cuyahoga, OH, RB,
             Series 1992B (CRE)                 5.58    6/01/22     21,500
- --------------------------------------------------------------------------

            Textiles - Home Furnishings
   10,000   Alabama IDA RB (Fieldcrest 
             Project) (CRE)                     5.85    7/01/21     10,000
- --------------------------------------------------------------------------
            Total variable rate demand notes
            (cost: $510,965)                                       510,965
- --------------------------------------------------------------------------

                           VARIABLE RATE NOTES (20.1%)
            Banks - Major Regional
   10,000   American Express Centurion Bank,
             Bank Notes                         5.66   6/25/98      10,004
   40,000   American Express Centurion Bank,
             Bank Notes                         5.53   1/14/99      40,000
   18,000   Barnett Bank, Inc., MTN             6.03  12/28/98      18,029
   10,000   Household Bank, Bank Notes          5.99   6/15/98      10,003
   15,000   Huntington National Bank, MTN       5.71   1/13/99      15,010
   35,000   Long Lane Master Trust, Notes,
             Series 1997C                       5.78  11/02/98      35,000(b)
   14,800   Long Lane Master Trust, Notes,
             Series 1998A                       5.62   1/20/99      14,800(b)
   15,000   Mercantile Safe Deposit & 
             Trust, CD                          5.82   2/03/98      15,000
   17,000   SouthTrust Bank, Bank Notes         5.57   9/08/98      16,995
- ---------------------------------------------------------------------------
                                                                    174,841
- ---------------------------------------------------------------------------

            Finance - Consumer
   30,000   American Honda Finance Corp., MTN   5.82    4/06/98      29,999(a)
   40,000   American Honda Finance Corp., MTN   5.75    8/01/98      40,000(a)
   25,000   American Honda Finance Corp., MTN   5.62   10/22/98      25,000(a)
   15,000   American Honda Finance Corp., MTN   5.63    1/21/99      15,000(a)
   25,000   Chrysler Financial Corp., MTN       6.13    2/02/98      25,000
   50,000   General Motors Acceptance 
             Corp., MTN                         5.75    1/29/99      50,084
   25,000   Household Finance Corp., MTN        5.97    6/03/98      25,000
   30,000   Household Finance Corp., MTN        5.58    1/21/99      30,000
- ---------------------------------------------------------------------------
                                                                    240,083
- ---------------------------------------------------------------------------

            Leasing
   25,000   PHH Corp., MTN                      5.62    6/11/98      24,999
   20,000   PHH Corp., MTN                      5.59    7/27/98      20,000
- ---------------------------------------------------------------------------
                                                                     44,999
- ---------------------------------------------------------------------------

            Total variable rate notes (cost: $459,923)              459,923
- ---------------------------------------------------------------------------

            Total investments (cost: $2,318,656)                 $2,318,656
===========================================================================


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

            Finance - Consumer                             17.4
            Banks - Money Center                           17.0  
            Banks - Major Regional                         15.0
            Electric                                        6.0
            Finance - Diversified                           5.3
            Real Estate - Other                             4.4
            Nursing / Continuing  Care Centers              2.9
            Auto Parts                                      2.5
            General  Obligations                            2.4
            Healthcare  -  Specialized  Services            2.4
            Electric/Gas  Utilities                         2.3
            Asset Backed  Securities                        2.2
            Education                                       2.1
            Leasing                                         2.0
            Oil  -  Domestic  Integrated                    2.0
            Leisure   Time                                  1.9
            Oil  &  Gas  -   Refining/Manufacturing         1.7
            Hospitals                                       1.6
            Broadcasting  - Radio & TV                      1.3
            Healthcare -  Diversified                       1.2
            Paper & Forest Products                         1.2
            Machinery - Diversified                         1.0
            Other                                           5.4
                                                         ------
            Total                                        101.2%
                                                         ======



MONEY MARKET FUND
NOTES TO PORTFOLIO OF INVESTMENTS IN SECURITIES

January 31, 1998
(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 14.6% of net assets at January
31, 1998.

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

(b)  Securities are exempt from  registration  under the Securities Act of 1933.
Any resale of these  securities may occur in exempt  transactions  in the United
States  to a  qualified  institutional  buyer as  defined  by Rule  144A.  These
securities  have been  determined  to be  illiquid  by the Manager and are being
valued using methods determined by the Manager under general  supervision of the
Company's Board of Directors.  At January 31, 1998, these securities represented
2.2% of the Fund's net assets.

See accompanying notes to financial statements.



MONEY MARKET FUND
STATEMENT OF OPERATIONS
(IN THOUSANDS)

Six-month period ended January 31, 1998
(Unaudited)


Net investment income:
   Interest income                                                     $64,535
                                                                       -------
   Expenses:
      Management fees                                                    2,677
      Transfer agent's fees                                              1,946
      Custodian's fees                                                     329
      Postage                                                              173
      Shareholder reporting fees                                            97
      Directors' fees                                                        2
      Registration fees                                                    104
      Professional fees                                                     26
      Other                                                                 33
                                                                       -------
         Total expenses before reimbursement                             5,387
      Expenses reimbursed                                                 (397)
                                                                       -------
         Total expenses after reimbursement                              4,990
                                                                       -------
            Net investment income                                      $59,545
                                                                       =======


See accompanying notes to financial statements.



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

Six-month period ended January 31, 1998
and Year ended July 31, 1997
(Unaudited)


                                                       1/31/98        7/31/97
                                                       -------        -------
From operations:
   Net investment income                             $   59,545     $  103,156
                                                     ----------     ----------
Distributions to shareholders from:
   Net investment income                                (59,545)      (103,156)
                                                     ----------     ----------
From capital share transactions:
   Proceeds from shares sold                          1,594,629      2,797,676
   Dividend reinvestments                                57,462         99,655
   Cost of shares redeemed                           (1,522,938)    (2,564,389)
                                                     ----------     ----------
      Increase in net assets from capital
       share transactions                               129,153        332,942
                                                     ----------     ----------
Net increase in net assets                              129,153        332,942
Net assets:
   Beginning of period                                2,161,691      1,828,749
                                                     ----------     ----------
   End of period                                     $2,290,844     $2,161,691
                                                     ==========     ==========
Change in shares outstanding:
   Shares sold                                        1,594,629      2,797,676
   Shares issued for dividends reinvested                57,462         99,655
   Shares redeemed                                   (1,522,938)    (2,564,389)
                                                     ----------     ----------
      Increase in shares outstanding                    129,153        332,942
                                                     ==========     ==========
 Authorized shares of $.01 par value                  3,000,000      3,000,000
                                                     ==========     ==========

See accompanying notes to financial statements.



MONEY MARKET FUND
NOTES TO FINANCIAL STATEMENTS

January 31, 1998
(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 semiannual report pertains only to the
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  Company's  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 six-month period ended January 31,
1998.

(3)  DISTRIBUTIONS
Net  investment  income  is  accrued  daily  as  dividends  and  distributed  to
shareholders  monthly.  All net investment income available for distribution was
distributed at January 31, 1998.  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
Purchases  and  sales/maturities  of securities  for the six-month  period ended
January 31, 1998 were $ 10,259,578,552 and $10,162,093,000, 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 through July 31, 1998.

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 January 31, 1998, the  Association and its affiliates
(including  related employee benefit plans) owned 18,081,711 shares (.8%) 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>
                                Six-Month                                             
                              Period Ended            Year Ended July 31,            
                                January 31,    ---------------------------------                                       
                                   1998           1997        1996          1995      
                                   ----           ----        ----          ----        
<S>                              <C>           <C>          <C>           <C>          
Net asset value at
   beginning of period           $     1.00   $     1.00   $     1.00     $     1.00   
Net investment income                   .03          .05          .05            .05   
Distributions from net
   investment income                   (.03)        (.05)        (.05)          (.05)  
                                 ----------   ----------   ----------     ----------
Net asset value at
   end of period                 $     1.00   $     1.00   $     1.00     $     1.00   
                                 ==========   ==========   ==========     ==========
Total return (%) *                     2.72         5.28         5.41           5.49   
Net assets at
   end of period (000)           $2,290,844   $2,161,691   $1,828,749     $1,540,055 
Ratio of expenses to
   average net assets (%)               .45(a)       .45          .45            .45   
Ratio of expenses to
   average net assets
   excluding reimbursement (%)          .48(a)       .49          .51            .46   
Ratio of net investment
   income to average
   net assets (%)                      5.34(a)      5.16         5.27           5.44   




                                 Ten-Month
                                Period Ended     Year Ended
                                  July 31,      September 30,
                                    1994            1993
                                    ----            ----  

Net asset value at
   beginning of period           $     1.00      $    1.00
Net investment income                   .03            .03
Distributions from net
   investment income                   (.03)          (.03)
                                 ----------      ---------
Net asset value at
   end of period                 $     1.00      $    1.00
                                 ==========      =========
Total return (%) *                     2.74           3.09
Net assets at
   end of period (000)           $1,006,020      $ 813,784
$813,784
Ratio of expenses to
   average net assets (%)               .46(a)         .48
Ratio of expenses to
   average net assets
   excluding reimbursement (%)        -               -
Ratio of net investment
   income to average
   net assets (%)                      3.28(a)        3.05



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

</TABLE>


===============================================================================

                                    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
                          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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