FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * GUILFOIL THOMAS J   2. Issuer Name and Ticker or Trading Symbol ENGINEERED SUPPORT SYSTEMS INC [EASI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O ENGINEERED SUPPORT SYSTEMS INC, 201 EVANS LANE 3. Date of Earliest Transaction (Month/Day/Year) 01/31/2006 (Street) ST LOUIS, MO 63121 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 01/31/2006   D   113,949 D (1) 0 D

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Option to Purchase

$ 16.613

01/31/2006

D

8,438

03/04/2003

03/03/2008

Common

8,438

(2)

0

D

Option to Purchase

$ 35.833

01/31/2006

D

8,438

03/02/2004

03/01/2009

Common

8,438

(3)

0

D

Option to Purchase

$ 37.173

01/31/2006

D

8,438

03/01/2005

02/28/2010

Common

8,438

(4)

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
GUILFOIL THOMAS J C/O ENGINEERED SUPPORT SYSTEMS INC 201 EVANS LANE ST LOUIS, MO 63121	X

Signatures

/s/ Daniel Kreher, attorney in fact		02/02/2006
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	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.
(2)	This option was canceled pursuant to the Agreement and Plan of Merger between issuer and DRS Technologies, Inc. in exchange for $18.49 in cash and .1615 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.
(3)	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.
(4)	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.

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