US Navy designation for a fast-attack submarine.

Nuclear-powered attack submarine.

SSN (1996) is a novel by Tom Clancy following the missions of the US Navy nuclear attack submarine (SSN) USS Cheyenne during a fictional war with China over the Spratly Islands.

SSN is the United States Navy Hull classification symbol for a general-purpose fast attack submarine. The SS denotes a submarine, and the N denotes nuclear power.

Tom Clancy's SSN is a simulation of the 688i (Los Angeles-class) nuclear hunter/killer submarine. You are in command of USS Cheyenne in a limited war against China over the Spratly Islands. Gameplay is limited to a 15 mission single-player campaign in which the player carries out anti-submarine anti-surface ship roles, intelligence gathering activities, and the launch of submarine based cruise missiles.