I have a very detailed question... was there anything on the uniform of an American aviator which would fit this description:
"a small black badge bearing four initials... either USAF or USAR... wore on the breast and fastened with a needle."
Was the air service at that time yet OFFICIALLY designated as the United States Air Service? Perhaps USAS? And what, if any, part of an American uniform fit this description? This was not a button or medal; it was a piece of fabric apparently sewn into the uniform.
I'm trying to use a civilian's post-war description of a uniform to ascertain things and I don't have detailed knowledge of. EEK!

Many thanks.