Ownership Submission
FORM 3
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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
OMB APPROVAL
OMB Number: 3235-0104
Expires: January 31, 2005
Estimated average burden hours per response... 0.5

(Print or Type Responses)
1. Name and Address of Reporting Person *
  Keefe Daniel J
2. Date of Event Requiring Statement (Month/Day/Year)
02/04/2013
3. Issuer Name and Ticker or Trading Symbol
MANTECH INTERNATIONAL CORP [MANT]
(Last)
(First)
(Middle)
MANTECH INTERNATIONAL CORPORATION, 12015 LEE JACKSON MEMORIAL HWY
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Business Group President
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

FAIRFAX, VA 22033
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 Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Class A Common Stock 44
I
By the ManTech Employee Stock Ownership Plan

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(Month/Day/Year)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option (right to buy)   (1) 11/06/2017 Class A Common Stock 10,000 $ 26.24 D  
Employee Stock Option (right to buy)   (2) 03/15/2017 Class A Common Stock 3,000 $ 33.78 D  
Employee Stock Option (right to buy)   (3) 11/04/2016 Class A Common Stock 7,000 $ 33.53 D  
Employee Stock Option (right to buy)   (4) 08/01/2016 Class A Common Stock 15,000 $ 39.81 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Keefe Daniel J
MANTECH INTERNATIONAL CORPORATION
12015 LEE JACKSON MEMORIAL HWY
FAIRFAX, VA 22033
      Business Group President  

Signatures

/s/ Michael R. Putnam, by power of attorney 02/12/2013
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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) The options were granted on November 6, 2012, with one-third of the total grant vesting on November 6, 2013, one-third of the total grant vesting on November 6, 2014, and the remaining one-third vesting on November 6, 2015.
(2) The options were granted on March 15, 2012, with one-third of the total grant vesting on March 15, 2013, one-third of the total grant vesting on March 15, 2014, and the remaining one-third vesting on March 15, 2015.
(3) The options were granted on November 4, 2011, with one-third of the total grant vesting on November 4, 2012, one-third of the total grant vesting on November 4, 2013 and the remaining one-third vesting on November 4, 2014.
(4) The options were granted on August 1, 2011, with one-third of the total grant vesting on August 1, 2012, one-third of the total grant vesting on August 1, 2013, and the remaining one-third vesting on August 1, 2014.
 
Remarks:
Exhibit 24.1 Power of Attorney filed herewith

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See 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.