|World War II Army Officer Cap Device|
My father wore this "officer cap device" on his hat during World War II. To be perfectly honest, I wasn't sure what it was at first, but my husband explained it to me.
If you'd like to know more about World War II collectibles, the following book might help:
Warman's World War II Collectibles: Identification and Price Guide by John F Graf (available on amazon.com).