MIL-H-83147, MILITARY SPECIFICATION: HELMET, SHELL, FLYING, HGU-22/P (24-JUN-1968) [S/S BY MIL-DTL-87174]

MIL-H-83147, MILITARY SPECIFICATION: HELMET, SHELL, FLYING, HGU-22/P (24-JUN-1968) [S/S BY MIL-DTL-87174]., This specification covers one type of protective helmet shell designated HGU-22/P.