Hanging out with US Army, Air Force, Navy or law enforcement types can get very expensive if you don’t have one of these in your pocket. They’re bar coins. If you’re at a bar and someone produces their unit bar coin and you can’t match it with one of your own, the drinks are on you, sucker.
I’ve started a bit of a collection of these, a few of which are shown here. The Texas Rangers reckon their coin trumps all other coins, but that’s the kinda guys they are. They can take that up with the folks who load the nuclear weapons.