Rare Star Trek USS Enterprise CVN-65 Navy CPO Mess Big E Chiefs Challenge Coin. This original challenge coin features military navy imagery and is a must-have for fans of the Star Trek franchise and military memorabilia collectors. Its unique design and rarity make it a valuable and sought-after piece for enthusiasts looking to add a special item to their collection. 2 1/4″ x 3″ inches. High relief detail in excellent shape.