When I did my qual I noticed that some of the collar types do not play well with helmets. When I inflated one of the PFD's you'd find under your seat on a civilian airliner, it caused a lot of upward pressure on the chin strap. Not as bad with the LPU-32/P.
Ive been watching videos of people using airline type PFDs, and wow do they look uncomfortable. Seems that they are designed to inflate tight around your neck so that you cant get them off.
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