X0202 4 2006-01-31 1 0000772891 ENGINEERED SUPPORT SYSTEMS INC EASI 0001168957 FRIEL GEORGE E C/O ENGINEERED SUPPORT SYSTEMS, INC. 201 EVANS LANE ST. LOUIS MO 63121 1 0 0 0 Common Stock 2006-01-31 4 D 0 5639 D 0 D Option to Purchase 35.833 2006-01-31 4 D 0 8438 D 2004-03-02 2005-03-01 Common 8438 0 D Option to Purchase 37.173 2006-01-31 4 D 0 8438 D 2005-03-01 2010-02-28 Common 8438 0 D Disposed of pursuant to Agreement and Plan of Merger between issuer and DRS Technologies, Inc. in exchange for $30.10 in cash and .2628 shares of DRS common stock having a value of $49.425 per share on the effective date of the merger. This option was canceled pursuant to the Agreement and Plan of Merger between issuer and DRS Technologies, Inc. in exchange for $5.07 in cash and .0443 shares of DRS common stock, representing the difference between the exercise price of the option and the merger consideration. The per share merger consideration was $30.10 in cash and .2628 shares of DRS common stock having a market value of $49.425 on the effective date of the merger. This option was canceled pursuant to the Agreement and Plan of Merger between issuer and DRS Technologies, Inc. in exchange for $4.13 in cash and .0361 shares of DRS common stock, representing the difference between the exercise price of the option and the merger consideration. /s/ Daniel Kreher, attorney in fact 2006-02-02