A black belt coin is a type of challenge coin. A challenge coin is a small coin or medallion used primarily by the military or military-like organizations, such as police or fire departments, that bears an organization’s insignia or emblem and is carried by the organization’s members. Traditionally, the coins are given to prove membership when challenged and to enhance morale. They are also collected by many current and ex members. Challenge coins may be presented by unit commanders in recognition of special achievement by a member of the unit or exchanged in recognition of visits to an organization.
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