-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 JnNtpFcinf2l0lpRtLxQIOO3mh7/o4Tv1hZMqurnkBYToLOlN5xGcTtnuzxQdSq8
 b+IpZTEf5rXFVjAyFbb23w==

<SEC-DOCUMENT>0001068800-03-000566.txt : 20030922
<SEC-HEADER>0001068800-03-000566.hdr.sgml : 20030922
<ACCEPTANCE-DATETIME>20030922161130
ACCESSION NUMBER:		0001068800-03-000566
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030919
FILED AS OF DATE:		20030922

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			LANDMANN STEVEN J
		CENTRAL INDEX KEY:			0001249021

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-13880
		FILM NUMBER:		03904409

	BUSINESS ADDRESS:	
		STREET 1:		C/O ENGINEERED SUPPORT SYSTEMS INC
		STREET 2:		201 EVANS LANE
		CITY:			ST LOUIS
		STATE:			MO
		ZIP:			63121
		BUSINESS PHONE:		3145534000

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ENGINEERED SUPPORT SYSTEMS INC
		CENTRAL INDEX KEY:			0000772891
		STANDARD INDUSTRIAL CLASSIFICATION:	AIR COND & WARM AIR HEATING EQUIP & COMM & INDL REFRIG EQUIP [3585]
		IRS NUMBER:				431313242
		STATE OF INCORPORATION:			MO
		FISCAL YEAR END:			1031

	BUSINESS ADDRESS:	
		STREET 1:		201 EVANS LN
		CITY:			ST LOUIS
		STATE:			MO
		ZIP:			63121
		BUSINESS PHONE:		3149935880

	MAIL ADDRESS:	
		STREET 1:		201 EVANS LN
		CITY:			ST LOUIS
		STATE:			MO
		ZIP:			63121
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>landmann_ex.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<!-- - EDGAR Ease Plus 1.0                                   07/25/03  TT    -->
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>
   <periodOfReport>2003-09-19</periodOfReport>
   <notSubjectToSection16>0</notSubjectToSection16>
    <issuer>
        <issuerCik>0000772891</issuerCik>
        <issuerName>ENGINEERED SUPPORT SYSTEMS INC</issuerName>
        <issuerTradingSymbol>EASI</issuerTradingSymbol>
   </issuer>
   <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001249021</rptOwnerCik>
            <rptOwnerName>LANDMANN STEVEN J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ENGINEERED SUPPORT SYSTEMS INC</rptOwnerStreet1>
            <rptOwnerStreet2>201 EVANS LANE</rptOwnerStreet2>
            <rptOwnerCity>ST LOUIS</rptOwnerCity>
            <rptOwnerState>MO</rptOwnerState>
            <rptOwnerZipCode>63121</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
         <isDirector>0</isDirector>
         <isOfficer>1</isOfficer>
         <isTenPercentOwner>0</isTenPercentOwner>
         <isOther>0</isOther>
         <officerTitle>VP - Finance &amp; Controller</officerTitle>
      </reportingOwnerRelationship>
   </reportingOwner>
 <nonDerivativeTable>
   <nonDerivativeTransaction>
      <securityTitle>
         <value>Common Stock</value>
      </securityTitle>
      <transactionDate>
         <value>2003-09-19</value>
      </transactionDate>
      <transactionCoding>
         <transactionFormType>4</transactionFormType>
         <transactionCode>M</transactionCode>
         <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionAmounts>
         <transactionShares>
           <value>25000</value>
         </transactionShares>
         <transactionPricePerShare>
           <value>28.60</value>
         </transactionPricePerShare>
         <transactionAcquiredDisposedCode>
           <value>A</value>
         </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <postTransactionAmounts>
         <sharesOwnedFollowingTransaction>
           <value>31092</value>
         </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
         <directOrIndirectOwnership>
            <value>D</value>
         </directOrIndirectOwnership>
      </ownershipNature>
   </nonDerivativeTransaction>
   <nonDerivativeTransaction>
      <securityTitle>
         <value>Common Stock</value>
      </securityTitle>
      <transactionDate>
         <value>2003-09-19</value>
      </transactionDate>
      <transactionCoding>
         <transactionFormType>4</transactionFormType>
         <transactionCode>S</transactionCode>
         <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionAmounts>
         <transactionShares>
           <value>21800</value>
         </transactionShares>
         <transactionPricePerShare>
           <value>64.735</value>
         </transactionPricePerShare>
         <transactionAcquiredDisposedCode>
           <value>D</value>
         </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <postTransactionAmounts>
         <sharesOwnedFollowingTransaction>
           <value>9292</value>
         </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
         <directOrIndirectOwnership>
            <value>D</value>
         </directOrIndirectOwnership>
      </ownershipNature>
   </nonDerivativeTransaction>
 </nonDerivativeTable>
 <derivativeTable>
   <derivativeTransaction>
      <securityTitle>
         <value>Option to Purchase</value>
      </securityTitle>
      <conversionOrExercisePrice>
         <value>28.60</value>
      </conversionOrExercisePrice>
      <transactionDate>
         <value>2003-09-19</value>
      </transactionDate>
      <transactionCoding>
         <transactionFormType>4</transactionFormType>
         <transactionCode>X</transactionCode>
         <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionAmounts>
         <transactionShares>
           <value>25000</value>
         </transactionShares>
         <transactionPricePerShare>
           <value>28.60</value>
         </transactionPricePerShare>
         <transactionAcquiredDisposedCode>
           <value>D</value>
         </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <exerciseDate>
         <value>2002-07-24</value>
      </exerciseDate>
      <expirationDate>
         <value>2007-07-23</value>
      </expirationDate>
      <underlyingSecurity>
         <underlyingSecurityTitle>
           <value>Common</value>
         </underlyingSecurityTitle>
         <underlyingSecurityShares>
           <value>25000</value>
         </underlyingSecurityShares>
      </underlyingSecurity>
      <postTransactionAmounts>
         <sharesOwnedFollowingTransaction>
           <value>35000</value>
         </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
         <directOrIndirectOwnership>
           <value>D</value>
         </directOrIndirectOwnership>
      </ownershipNature>
   </derivativeTransaction>
 </derivativeTable>
   <ownerSignature>
      <signatureName>/s/ Steven J. Landmann</signatureName>
      <signatureDate>2003-09-22</signatureDate>
   </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----