A while back I bought with a B9 Parka, two A8 O2 masks, and a pair of pinback crew member wings and a bunch of other items that I can't remember exactly. Something rings a bell that he was in for a while after the war, maybe even later that 1948. So maybe USAF. I remember seeing a similar item with the 4 snap that may have been for attaching to the inside of a cockpit, or ejection seat or something along those lines, but that's what I get for not paying attention.