Warriors From The Sea. This coin is 1 7/8 inches wide by 2 1/2 inches high. (SDV) and a Dry Deck Shelter. The normal table of organization includes three task units and a headquarters element. Each SDV Task Unit operates independently from a host submarine in the conduct of Naval Special Warfare missions. SDV Task Units typically deploy aboard host submarines, but may be deployed from shore or surface ships. SDVT-1 conducts operations throughout the Pacific. Command’s and Central. Command’s geographic areas of responsibility. Never personally given any of the coins. All coins are guaranteed to be in excellent condition unless otherwise specified above. The free listing tool. The item “USS Michael Murphy SDVT-1 SEAL First Class Petty Officer Navy Challenge Coin” is in sale since Saturday, January 4, 2020. This item is in the category “Collectibles\Militaria\Current Militaria (2001-Now)\Original Items\Challenge Coins”. The seller is “rolyat11″ and is located in Panama City, Florida. This item can be shipped worldwide.