Naval Special Warfare Group Two. Logistics and Support Unit. Condition: Used, and in good shape. It is 1 3/4 inches in diameter. 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 SEALs Log and Sup Navy Chief Challenge Coin / 2″ is in sale since Friday, June 26, 2015. 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.