US Army, Technical Manual, TM 55-1680-317-CL-4, CHECKLIST FOR SRU-21/P AIRCREW SURVIVAL VEST, PART NO. 11-1-178, (NSN 8465-00-177-4819), 1981
Scope. The inspections prescribed by this manual will be accomplished at specified periods by organizational maintenance activities with assistance of direct and general support activities when required.
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