Naval Special Warfare Development Group DEVGRU SEAL Team 6 Navy Challenge Coin 2. The item “Naval Special Warfare Development Group DEVGRU SEAL Team 6 Navy Challenge Coin 2″ is in sale since Saturday, July 20, 2019. This item is in the category “Collectibles\Militaria\Current Militaria (2001-Now)\Original Items\Challenge Coins”. The seller is “amendment02″ and is located in Front Royal, Virginia. This item can be shipped to United States.