Can anyone identify these buttons for me? They look like collar insignia, but have loops, like buttons, rather than pins on their back. They're quite small, with a diameter of 15mm. I've been Googling for awhile, now, but haven't found a match. This surprises me, as I expect they're a pretty common item. If they are buttons, which USAAC or USAAF uniform were they intended for? Thanks!
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