in the seventh mission of the 2009 video game, Call of Duty: Modern Warfare 2, titled "The Only Easy Day... Was Yesterday". References Further reading Chicago (Submarine (nuclear-powered) : SSN-721), and Newport News Shipbuilding and Dry Dock Company. Chicago Launching of SSN721, October 13, 1984. Newport News, Va: Newport News Shipbuilding, Tenneco Co, 1984. Chicago (Submarine (nuclear-powered) : SSN-721). Welcome Aboard, USS Chicago SSN 721. United States: s.n, 1993. Genat, Robin and Genat, Robert. Modern U.S. Naval Submarines. Osceola, WI: MBI Publishing Company, 1997. External links Commander Submarine Force, U.S. Pacific Fleet 721 Club – Civilian Support Organization for the Crew of SSN 721 Los Angeles-class submarines Cold War submarines of the United States Nuclear submarines of the United States Navy 1984 ships Submarines of the United States Ships built in Newport News, Virginia