Navy MWD/K9 Challenge Coin. The item “Navy MWD/K9 Challenge Coin” is in sale since Thursday, September 17, 2020. This item is in the category “Collectibles\Militaria\Current Militaria (2001-Now)\Original Items\Challenge Coins”. The seller is “ingoldba” and is located in Davenport, Florida. This item can be shipped to United States.