Rare Navy charge book chief cpo coin. The item “Amazing Rare 3 Navy USN CPO Chiefs Challenge Coin SPAWAR 2017 Charge Book” is in sale since Thursday, August 16, 2018. This item is in the category “Collectibles\Militaria\Current Militaria (2001-Now)\Original Items\Challenge Coins”. The seller is “flightdoc89″ and is located in FPO, Armed Forces Pacific. This item can be shipped to United States.