SEC Form 4

FORM 4 [ ] Check this box if no longersubject to Section 16. Form 4 or Form5 obligations may continue.See Instruction 1(b). UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP 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(fh) of the Investment Company Act of 1940 OMB APPROVAL OMB Number: 3235-0287 Expires: January 31, 2005Estimated average burdenhours per response. . . . . 0.5

1. Name and Address of Reporting Person* Vaughan, Walter W. (Last) (First) (Middle) c/o ManTech International Corporation 12015 Lee Jackson Highway (Street) Fairfax, VA 22033 (City) (State) (Zip) 2. Issuer Name and Ticker or Trading Symbol ManTech International Corporation ( 3. I.R.S. Identification Number of Reporting Person, if an entity (voluntary) 4. Statement for Month/Day/Year) 09/0313/2002 5. If Amendment, Date of Original (Month/Day/Year) 6. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner Officer (give title below) Other (specify below) Description 7. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

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. Owner-
    ship
    Form:
    Direct (D)
    or
    Indirect (I)

    (Instr. 4)

7. Nature of
     Indirect
     Beneficial
     Ownership

    (Instr. 4)

Code

Amount

A/D

Price

Class A Common Stock

09/13/2002

14,266

$23.03

10,000

By IRA

1. Title of Security (Instr. 3)

2.TransactionDate(Month/Day/Year)

2A. Deemed Execution Date, if any(Month/Day/Year)

3. Transaction Code (Instr. 8) Code / V

4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4, and 5) Amount / A/D / Price

5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)

6. Owner- ship Form: Direct (D) or Indirect (I) (Instr. 4)

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

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

Class A Common Stock

09/03/2002

S /

20,000 / D / $24.0533

24,266

By IRA

1. Title of Derivative Security (Instr. 3)

2. Conver- sion or Exercise Price of Deri- vative 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(DE) and Expiration Date(ED) (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. Owner-shipForm ofDeriv-ativeSecurities:Direct (D)orIndirect (I)(Instr.4)

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

Code

Title

Amount or Number of Shares

Explanation of Responses:

~~Table~~By: II/s/ Walter W. Vaughan 09/16/2002 ** Signature of Reporting Person Date SEC 1474 (8-02) ~~Derivative~~Reminder: ~~Securities~~Report ~~Acquired,~~on ~~Disposed~~a separate line for each class of, securities beneficially owned directly or ~~Beneficially~~indirectly. ~~Owned~~* If the form is filed by more than one reporting person, see Instruction 4(eb)(v).g ** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.,S.C. ~~puts,~~1001 ~~calls,~~and ~~warrants~~15 U.S.C. 78ff(a). Note: File three copies of this Form, ~~options~~one of which must be manually signed. If space is insufficient, ~~convertible~~see ~~securities)~~Instruction 6 for procedure. Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

1. Title of Derivative Security (Instr. 3)	2. Conver- sion or Exercise Price of Deri- vative Security	3. Transaction Date(Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr.8) Code / V	5. Number of Derivative Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) (A) or (D)	6. Date Exercisable(DE) and Expiration Date(ED) (Month/Day/Year) (DE) / (ED)	7. Title and Amount of Underlying Securities (Instr. 3 and 4) Title / Amount or Number of Shares	8. Price of Derivative Security (Instr.5)	9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr.4)	10. Owner-shipForm ofDeriv-ativeSecuritiesBeneficially Owned at End of Month(Instr.4)	11. Nature of Indirect Beneficial Ownership (Instr.4)
	$			/		/	/	$

By: /s/ Walter W. Vaughan 09/05/2002 ** Signature of Reporting Person Date SEC 1474 (8-02) Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. * 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). Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure

Filing Compare · VAUGHAN WALTER W