Air Force Challenge Coin Tribute CollectionCategory: Airborne Challenge CoinMilitary Tributes are unique products to honor America's Bravest. Each coin represents the celebration of the men and women who protect our freedom and safety. This tribute coin collection, comprised with brilliant pictures, holds a 39 mm bronze challenge coin affixed to a sturdy tri-fold card describing the history and contributions that the Air Force has made.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.