MIL-H-87140A, MILITARY SPECIFICATION: HELMET, FLYER'S HGU-36/P (03 APR 1987

MIL-H-87140A, MILITARY SPECIFICATION: HELMET, FLYER'S HGU-36/P (03 APR 1987)., This specification covers the HGU-36A/P flyer's helmet, which of one type, and provided in sizes medium and large.