EXHIBIT 32.2

CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

(18 U.S.C. SECTION 1350)

In connection with the accompanying Quarterly Report of Kratos Defense & Security Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended September 27, 2015 (the “Report”), I, Deanna H. Lund, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2)  The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 5, 2015

KRATOS DEFENSE & SECURITY SOLUTIONS, INC.

/s/ DEANNA H. LUND

Deanna H. Lund

Executive Vice President, Chief Financial Officer

(Principal Financial Officer and Acting Principal Accounting Officer)