Unknown Brown and black corporal rank with diamond

[Siamundo]

This was in a mixed group of US military patches I recently picked up and don't recognize it at all. I looked through what US Army chevron reference material I could find but not pictured a diamond device. Any ideas?

[Siamundo]

Backside

[Wake1941]

Certainly looks pre-WW2. But the color and material looks Army

[patches]

1920s 30s ROTC???

[Siamundo]

Thank you both. I agree that I have a feeling it is possibly 1920's or 30's vintage and probably army. Hadn't thought about ROTC, but maybe it could be a cadet rank?

[Lee Ragan]

It is an Army Air Force Aviation Cadet 1st Sergeant chevron. Check Emerson's book on Army chevrons. These were phased out after WWII when the independent USAF was created.

[Siamundo]

Oh cool, thank you Lee. I had checked different random articles from Mr Emerson online and through ASMIC but hadn't run across this one. I appreciate the ID!

[patches]

It is an Army Air Force Aviation Cadet 1st Sergeant chevron. Check Emerson's book on Army chevrons. These were phased out after WWII when the independent USAF was created.

Is that right, and I got the book too Got to reread it again, haven't looked at it in a few years