Exhibit 32.1


                           CERTIFICATION PURSUANT
                            TO SECTION 906 OF THE
                         SARBANES-OXLEY ACT OF 2002


                  In connection with the quarterly report of Engineered
Support Systems, Inc. (the "Company") on Form 10-Q for the period ended July
31, 2005 (the "Report"), I, Gerald A. Potthoff, Vice Chairman and Chief
Executive Officer of the Company, certify, pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002 that:

         (1) The Report complies with Sections 13(a) and 15(d) of the
             Securities Exchange Act of 1934; and,

         (2) The information contained in the Report fairly presents, in all
             material respects, the financial condition and results of
             operations of the Company.


Date:       September 9, 2005
      ----------------------------


By:   /s/ Gerald A. Potthoff
      ----------------------------
      Gerald A. Potthoff
      Vice Chairman and Chief
      Executive Officer


A signed original of this written statement required by Section 906 has been
provided to Engineered Support Systems, Inc. and will be retained by
Engineered Support Systems, Inc. and furnished to the Securities and
Exchange Commission or its staff upon request.