Come and see our amazing products. Zinc medals are our most popular and economical badge, rivals the quality of a Brass electroplate at a lighter weight. They were issued to battalions as symbols of camaraderie and unity. Later, they were used as a way of verifying membership in a club, group, or military . Challenge medals are now commonly given away at military and DOD meetings as a token of appreciation or as promotional product. Free: Digital Initial Consultation. Pls confirm with us about the packing info, stock color and exact production time before placing your order.