Military Challenge Coin. US Navy – United States Navy – USN. Naval Support Activity Bahrain. Southwest Asia – Bahrain. Chiefs – Officers – Petty Officers – Deck Plate – Diamond Plate. Coin is maintained in a. See pictures for visual details. Photos taken with and without camera flash. Hotos may show currency, soda cans and/or props along with item(s) for size representation only. Items are unique, cool and sometimes random, just like our universe. Orders are often sent using acceptable, clean, recycled envelopes, boxes and materials. The ad price is our price. Thank you for looking.