A-9 flight helmet with Gosports installed, used by cadets
for training, early war.
B-5 flight helmet with special cut to facilitate the
use of oxygen masks. Used in winter, early war.
Another B-5 helmet without cut-out and with R-14 receivers
installed. Note the chin cup instead of the later chin strap.
AN-H-15 flight helmet with ANB-H-1 receivers installed,
A-10A flight helmet with ANB-H-1 receivers in place, late
Back view of A-10A helmet (left) with cloth goggle straps
and AN-H-15 helmet (right) with leather goggle straps.