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 are (4) Army Ten Miler Washington DC Challenge Coins in the lot. There are two poker chip style USMC Marine Tiltrotor Squadron coins in the lot. There is an Army Achievement Medal AAM and a Meritorious Service Medal MSM in the lot. There is a Army Medical Services Belt Buckle in the lot engraved ...