The original liner for the H-3 helmet had three snaps on each side for mask attachment.
Later H-3 and H-4 liners had two snaps on each side for mask attachment. All of the
Korean War photos that I have seen show H-3 helmets instead of H-4 and three snaps on each
side of the liner for the mask. I believe the USN/USMC used cotton (parachute rigger
made?) straps attached to the mask face piece body with a single snap on each side. It is
possible that the USAF nylon assy. with two snaps on the left side of the mask and a
bracket on the right side for the helmet liner snap-on clip assy. could have been used?
I guess it is also possible for a USAF style mask strap configuration made from cotton
straps to be used by the USN/USMC? Hope this helps.
Edited by northcoastaero, 17 February 2017 - 04:41 PM.