Here at army surplus world we carry U.S. Army Challenge Coins. The Army Engineers Challenge Coin is two sided, made with premium metal and, has a diamond cut edge. The Army Engineers Challenge Coin is approximately 1-5/8 in diameter. The Army Engineers Challenge Coins have been upheld as treasured symbols of an unbreakable bond. Order your Army Engineer Challenge Coin for your own collection or as a gift from Army Surplus World today!