You have a "challange coin". They are called challange coins because you are supposed to carry them and, if you dont have one and are "challanged" you owe everyone in the bar a round. Soooooooooooo, that was long ago and many politically correct lifetimes ago. Now they are given as sort of a good job coin by commanders and sergeant majors (AKA Sergeants major,,,,,,whichever). Go to fleebay and type in military challange coins. Youll see. Good find BTW. Ranks WAY above finding a geocoin.