Military Tributes are unique products to honor America's Bravest. This 39 mm bronze challenge coin represents the celebration of the men and women who protect our freedom and safety. Challenge Coins have a deep-rooted history. Everything from associating with comrades of particular military campaigns, to law enforcement pride, to individual accomplishments. The idea of carrying your challenge coin is a way of carrying your identity. If a fellow carrier of a challenge coin should “challenge” you, it is with pride and confidence that you present your coin as proof of commitment.