United States Army 1st Armored Division Old Ironsides Challenge Coin Coin Measures 1-5/8" diameter High Quality Design and Metalwork Double-Sided Coin Challenge coins are the number one collectible item for US Military personnel. Almost every unit now has its own unique coin.
Challenge coins can be used to signify membership in a particular squadron or regiment, be presented by unit commanders in recognition of special achievement by a member of their unit, or to commemorate a special event or occasion.
Challenge coins can be used to signify membership in a particular squadron or regiment, be presented by unit commanders in recognition of special achievement by a member of their unit, or to commemorate a special event or occasion.