Help with aviation pin identification . . . .

[Mauser HSc]

Initially, I thought these were Civil Air Patrol but I can't find any like it anywhere.

Who wore these pins? Are they military or civilian?

They are marked on the reverse:

R Velle & Co
Washington DC
Phila PA
Sterling

Thank you

[tredhed2]

They are distinctive insignia for the WW 2 AAF Air Service Command. Enlisted personnel wore them on the lower lapels of their coats, and sometimes overseas caps; officers wore them on the shoulders of their coats. Approved 8 Jan 43.

[Mauser HSc]

They are distinctive insignia for the WW 2 AAF Air Service Command. Enlisted personnel wore them on the lower lapels of their coats, and sometimes overseas caps; officers wore them on the shoulders of their coats. Approved 8 Jan 43.

Thanks!