Naval Special Warfare Group Two. It is 2 x 2 inches. The consist of SEAL Team TWO, SEAL Team FOUR, SEAL Team EIGHT, and Naval Special Warfare Unit TEN. 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 Two Gunner’s Mate Navy SEALs Challenge Coin / 2″ is in sale since Friday, September 29, 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.