MIL-H-27856D, MILITARY SPECIFICATION,: HELMET, FLYING HGU-7/P (08 MAY 1981) [NO S/S DOCUMENT]

MIL-H-27856D, MILITARY SPECIFICATION,: HELMET, FLYING HGU-7/P (08 MAY 1981) [NO S/S DOCUMENT]., This specification covers one type of flyer's helmet with a removable sunshade and headset-microphone H-256/AIC. The helmet is designated HGU-7/P and is furnished in small, medium, and large sizes as specified (see 6.2).