EXHIBIT 23 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 33-14504, 333-45020, 333-45022, 333-64126, 333-65490, 333-97859, 333-97861, 333-101161, 333-110165 and 333-110166) of Engineered Support Systems, Inc. of our report dated December 9, 2003 relating to the financial statements, which is incorporated in this Annual Report on Form 10-K. We also consent to the incorporation by reference of our report dated December 9, 2003 relating to the financial statement schedule, which appears in this Form 10-K. /s/ PricewaterhouseCoopers LLP - --------------------------------- PricewaterhouseCoopers LLP St. Louis, Missouri January 30, 2004