Coins Challenge Coin lot set Collection Military Most Army Signal Corps US. Military Units, DoD Contractors, OIF, OEF, DoD, Army, Marine, Navy, Air Force, military support, government, police. I make NO claims to ANY silver (or any other metal) content of any coin that is in this lot. There is a small bronze tone 1 inch coin that is USMC Marine Corps Foundation token. There is a National Defense Service Medal in the lot. There are two POW MIA Military Missing in Action Challenge Coins in the lot. There is a an Army Good Conduct Service Medal in the lot. There is 1 New in Package ...