Triton was unique among U.S. submarines in carrying a propulsion plant with two nuclear reactors, each an S4G rated at 22,000 horsepower. She was also the last U.S. submarine to have a conning tower inside the sail, twin screws, and an after torpedo room. Like Sailfish and Salmon, she was optimized for high surface speed - with a knife-like bow and ample reserve buoyancy - and reportedly, she exceeded 30 knots on her trials.
USS TRITON ( SSN 586) was designed to be fast enough to operate with a fast carrier task force. One of the largest submarines ever built, Triton is 447 feet long, displaces more than 7700 tons submerged, and carries a crew of approximately 170. Her keel was hid 29 May 1956, she was launched 19 Aug. 1958, and was commissioned 10 Nov. 1959. She has two pressurized water reactors, one for each of her two propellers.
With the successful introduction of carrier-borne early warning aircraft in 1958 - first the Grumman E-1B Tracer, and then the successor E-2 Hawkeye in 1964 - the requirement for surface radar pickets soon faded, and the SSR/SSRN mission was quickly phased out. Thus, in March 1961, Triton was reclassified as an attack submarine (SSN) and overhauled at Portsmouth between 1962 and 1964 to refuel her reactors and convert her for a new role. Even though she was too large to be effective as an attack boat, Triton - now SSN-586 - served gamely at Norfolk as flagship of COMSUBLANT until June 1967, but nonetheless she had become an expensive white elephant. Although plans were floated to use her large, surviving CIC space as an alternative national emergency command post, these never came to fruition, and when a planned 1967 overhaul was cancelled because of defense cutbacks, her days were numbered. Triton was subsequently inactivated and then decommissioned in May 1969 - the first nuclear-powered submarine to be withdrawn from service.