The Kingfish. The Navy has deployed the first MK18 Mod 2 underwater unmanned vehicle for minehunting to the Middle East following a series of tests in the Gulf of Mexico, Naval Sea Systems Command (NAVSEA) says. The “Kingfish” UUV underwent more than 30 sorties during a two-week period in May to assess its capabilities before it was shipped to the U.S. Fifth Fleet in Bahrain. Kingfish is to replace the “Swordfish” systems by offering improved endurance and area coverage. The UUVs operate from an inflatable boat.