"He who marches out of step hears another drum." ~ Ken Kesey
Cool, I never found one clear enough to redraw. On the first link I posted, you couldn't even tell where the Eagle's head was.
My son-in-law was one (desert storm era), and I was gonna make something indicating the fact. He said absolutely not. It causes too many problems, as everyone wants to prove they're better that the best. It's an easy way to get into unwanted fights.