MIL-C-83409 (AMENDMENT 1), MILITARY SPECIFICATION: COATINGS, VISOR, POLYCARBONATE, FLYING HELMET (05-FEB-1974)

MIL-C-83409 (AMENDMENT 1), MILITARY SPECIFICATION: COATINGS, VISOR, POLYCARBONATE, FLYING HELMET (05-FEB-1974)., This amendment forms a part of Military Specification MIL-C-83409(USAF) dated 9 February 1973.