Naval Special Warfare Group 3. Condition: Used, but in good condition. The coin is 2 1/4 inches top to bottom. NOTE: Never personally given any of the coins. All coins are guaranteed to be in excellent condition unless specified above. The free listing tool. The item “Naval Special Warfare Group 3 Chief’s Mess Navy Challenge Coin” is in sale since Monday, May 1, 2017. This item is in the category “Collectibles\Militaria\Current Militaria (2001-Now)\Original Items\Challenge Coins”. The seller is “rolyat11″ and is located in Panama City, Florida. This item can be shipped worldwide.