Here we have examples of U. S. Air Force Commander's Recognition Coin and the U.S. Navy ship USS Halyburton's coin commemorating the loss of three shipmates during a tour of duty.
Challenge Coins have a steep tradition in the military community for a variety of different reasons, events or awards. The challenge coin tradition has spread to all branches of service, and even to non-military organizations as well as the United States Congress, which produces challenge coins for members of Congress to give to constituents. Today, challenge coins are given to members upon joining an organization, as an award to improve morale, and sold to commemorate special occasions or as fundraisers. In the Air Force, military training instructors award an airman's coin to new enlisted personnel upon completion of their United States Air Force Basic Military Training and to new officers upon completion of the Air Force Officer Training School.