Traditionally , they are given to prove membership when challenged and to enhance morale .
A challenge coin is a small coin ( usually military or law enforcement ) , bearing an unit 's insignia and carried by the team 's members .
Traditionally , members are given to prove membership when challenged and to enhance morale .
A challenge coin is a small coin ( usually military or law enforcement ) , bearing an unit 's insignia and carried by the team 's members .