Roman numeral for 5th?
Yellow suggests training purposes, I would not want to face an enemy with that on my helmet.
I agree with bright color, looks like you would have a "mark" on your head.
The yellow is coming across brighter due to my flash.
I can tell you what its not, US Army 5th Inf Div. was a Red Diamond, US Army V Corp was a Pentagon shape made up of 5 Triangles , USMC V Corp was 3 stars and a alligator head on a shield.
Yes it could be for a training or service support unit but I'm leaning towards US Navy or Coast Guard but can't give you a reason more of a gut feeling.
Thanks Phil, I'll head my research in that direction.
Moved your thread to the M1 forum.
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I also believe the markings are from a Training Unit....