US Navy Chief of Naval Operations Jonathan Greenert Challenge Coin. These are the best of the best of my coin collection. Very hard to find and not many have come up in my 20 years of collecting. Condition: Used, and in nice shape. Please look closely for possible edge wear, surface wear, scuffs, scratches, scrapes, dings, chips, dents, divots, bent, color loss, enamel loss, oxidation, patina, soiling, or corrosion. The pictures are part of the description. The images you see are actual pictures of the item taken by me – I do not use stock, borrowed, or internet pictures. What you see is what you’ll get. Note: Never personally given any of the coins. All coins are guaranteed to be in used condition unless otherwise specified above. Thank you for looking.