A History of the Challenge Coin
A challenge coin is a small coin or medallion (usually military), bearing an organization’s insignia or emblem and carried by the organization’s members. Traditionally, they are given to prove membership/affiliation when challenged and to enhance morale. In addition, they are also collected by service members. In another practice, challenge coins are presented by unit commanders in recognition of special achievement by a member of the unit. They are also exchanged in recognition of visits to an organization.