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ADDITIONAL INTERESTING INFORMATION
There are three major types of submarines in the United States Navy: ballistic missile submarines, attack submarines, and cruise missile submarines. All submarines in the U.S. Navy are nuclear-powered. Ballistic subs have a single strategic mission of carrying nuclear submarine-launched ballistic missiles. Attack submarines have several tactical missions, including sinking ships and subs, launching cruise missiles, and gathering intelligence. The submarine has a long history in the United States, beginning with the Turtle, the world's first submersible with a documented record of use in combat. The U.S. has 36 Los Angeles-class submarines on active duty and 26 retired, making it the most numerous nuclear-powered submarine class in the world. The class was preceded by the Sturgeon class and followed by the Seawolf and Virginia classes. Except for USS Hyman G. Rickover (SSN-709), submarines of this class are named after U.S. cities, breaking a Navy tradition of naming attack submarines after sea creatures. Ships from the USS Virginia afterwards are named after US States, a convention traditionally reserved for battleships and nuclear missile submarines. The final 23 boats in the series, referred to as "688i" boats, are quieter than their predecessors and incorporate a more advanced combat system. These 688i boats are also designed for under-ice operations: their diving planes are on the bow rather than on the sail, and they have reinforced sails.