Chairman Joint Chiefs Of Staff (CJCS). Condition: Used, but in nice shape. Enamel is hard baked. The coin is 1 3/4 inches in diameter. Has the proper and offical markings on it from manfacture of this coin. 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 “Admiral Mike Mullen Chairman Joint Chiefs of Staff CJCS Navy Challenge Coin” is in sale since Wednesday, May 24, 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.