X0202 4 2006-01-31 1 0000772891 ENGINEERED SUPPORT SYSTEMS INC EASI 0001249021 LANDMANN STEVEN J C/O ENGINEERED SUPPORT SYSTEMS INC 201 EVANS LANE ST LOUIS MO 63121 0 1 0 0 Sr. VP, Cont. & CAO Common Stock 2006-01-31 4 D 0 12475 D 0 D Common Stock 2006-01-31 4 D 0 1503 D 0 I By ESOP Option to Purchase 12.711 2006-01-31 4 D 0 60000 D 2002-07-24 2007-07-23 Common 60000 0 D Option to Purchase 29.458 2006-01-31 4 D 0 22500 D 2003-10-28 2008-10-27 Common 22500 0 D Option to Purchase 36.833 2006-01-31 4 D 0 22500 D 2004-07-15 2009-07-15 Common 22500 0 D Option to Purchase 35.570 2006-01-31 4 D 0 60000 D 2005-07-06 2010-07-05 Common 60000 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 $21.22 in cash and .1853 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 $9.52 in cash and .0831 shares of DRS common stock, representing the difference between the exercise price of the option and the merger consideration. This option was canceled pursuant to the Agreement and Plan of Merger between issuer and DRS Technologies, Inc. in exchange for $4.37 in cash and .0382 shares of DRS common stock, representing the difference between the exercise price of the option and the merger consideration. This option was canceled pursuant to the Agreement and Plan of Merger between issuer and DRS Technologies, Inc. in exchange for $5.25 in cash and .0459 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