X0206 3 2013-10-23 0 0001583513 Global Defense & National Security Systems, Inc. GDEF 0001476548 Perl Andrew Damian C/O GLOBAL DEFENSE & NATIONAL SECURITY 11921 FREEDOM DR, STE 550, 2 FOUNTAIN SQ RESTON VA 20190 1 0 1 0 Common Stock, par value $0.0001 2386935 I See footnote Assumes the forfeiture of 261,290 shares that are subject to mandatory redemption if the over-allotment option, as described in the Issuer's registration statement on Form S-1 (File No. 333-191195), is not exercised by the underwriters. Represents shares held by Global Defense & National Security Holdings LLC, a limited liability company indirectly controlled by Mr. Perl. Mr. Perl has voting and dispositive power over such shares. /s/ Thomas J. Ivey, Attorney-in-Fact 2013-10-23