US Navy Chief of Naval Operations CNO Admiral Jonathan W. Super rare, US Navy Chief of Naval Operations CNO Admiral Jonathan W. If you are a challenge coin collector this is a must have coin for your collection. If you are going to build a quality challenge coin collection this coin is a must have item. Please check my other listings for some more great coins. I will continue to post in the future with more coins. The item “US Navy Chief of Naval Operations CNO Admiral Jonathan Greenert Challenge Coin” is in sale since Monday, June 29, 2020. This item is in the category “Collectibles\Militaria\Current Militaria (2001-Now)\Original Items\Challenge Coins”. The seller is “itsmekurtr” and is located in United States. This item can be shipped to United States.