Kratos Defense & Security Solutions (KTOS) SC 13D KRATOS DEFENSE & SECURITY SOLUTIONS / MMI INVESTMENTS ownership change

Exhibit 99.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13D (including amendments thereto) with respect to the Common Stock, par value $0.001 per share, of Kratos Defense & Security Solutions, Inc.  This Joint Filing Agreement shall be filed as an Exhibit to such Statement.

Dated: February 18, 2011

MMI INVESTMENTS, L.P.
By:	MCM Capital Management, LLC General Partner
By:	/s/ Jerome J. Lande
	Jerome J. Lande
	Executive Vice President

MMI PLUS, L.P.
By:	MCM Capital Management, LLC General Partner
By:	/s/ Jerome J. Lande
	Jerome J. Lande
	Executive Vice President

MCM CAPITAL MANAGEMENT, LLC
By:	/s/ Jerome J. Lande
	Jerome J. Lande
	Executive Vice President

/s/ Clay B. Lifflander

Clay B. Lifflander