Exhibit 32.1

CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with this Amendment No. 1 on Form 10-Q/A of Global Defense Technology & Systems, Inc. (the “Company”) as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, John Hillen, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 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; 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: August 6, 2010	/s/ John Hillen
	John Hillen
	Chief Executive Officer, President

     A signed original of this written statement has been provided to the Company and will be retained by the Company and furnished to the SEC or its staff upon request.