US Army, Technical Manual, TM 55-1680-351-10, SRU-21/P ARMY VEST, SURVIVAL, (NSN 8465-00-177-4819), (LARGE), (8465-01-174-2355), (SMALL), 1987 This manual, issued expressly for the aircrewmember, is the official document for the vest survival kit used with Army aircraft. The purpose of this manual is to supply the aircrewmember with the latest information on kit contents and instructions on their intended uses. Packing instructions, drawing, and this manual are stored in right, inside pocket of vest.