military pin. Air Corps pin?

[Srhoads]

 

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[TheCannonballGuy]

It is a US Army Air Corps collar-disc insignia. Because yours has a plain smooth background and no raised rim around it, it dates from sometime between 1937 and 1947. I might be able to narrow down that date-range if you provide a couple of well-focused closeup photos of its back.

 

[clovis97]

Nice ID, Cannonball Guy.

I agree, it is a USAAF collar disc.