The Los Angeles-class attack submarines (SSN) are the most numerous class of nuclear powered submarines built by any nation, and form the bulk of the U.S. attack submarine force as of 2007. They were preceded by the Sturgeon-class. Usually named after U.S. cities, the class broke a long-standing Navy tradition of naming attack submarines after sea creatures. The boats are also colloquially referred to as "688-class" subs, after the hull classification symbol of the first boat, SSN-688.
Sea - Military - Submarines