USS Haddock (SSN-621) was the final vessel of the Thresher/Permit-class submarines built for the United States Navy, representing the culmination of this class's design and capabilities. Named after the haddock fish, she was constructed by Ingalls Shipbuilding in Pascagoula, Mississippi, with her keel laid on 24 April 1961 following the contract awarded on 24 August 1960. The submarine was launched on 21 May 1966, with Mrs. Corinne (Steven) Morris serving as sponsor. She was officially commissioned into service on 22 December 1967 under the command of Commander Stanley J. Anderson. Following her commissioning, USS Haddock conducted sea trials in the Gulf of Mexico before transiting the Panama Canal in early 1968. She was then drydocked at Puget Sound Naval Yard in spring 1968. By late 1968, she was assigned to Submarine Squadron 3 and arrived at her first homeport in San Diego in 1969. Her operational history includes multiple deployments to the Western Pacific, with her homeport later transferred to Pearl Harbor, where she underwent her first major overhaul, completed in 1972. During her service, Haddock earned the Meritorious Unit Commendation for notable achievements. In 1973, she underwent a resupply and refit in Hawaii, and after a 19-month overhaul at Mare Island in 1977, she was reassigned back to San Diego. Haddock continued active deployment, including participation in the Ready Ex-81 exercise in 1981, and completed her seventh Western Pacific deployment on 23 December 1983. Her third overhaul occurred at Mare Island in 1984, with her returning to her squadron in 1987. The submarine was awarded the Battle Efficiency "E" Award for fiscal year 1988. Her final Western Pacific deployment was from July to October 1991. USS Haddock was decommissioned and struck from the Naval Vessel Register on 7 April 1993. She entered the Nuclear Powered Ship and Submarine Recycling Program on 1 October 2000, with recycling completed by 1 October 2001. Throughout her service, USS Haddock exemplified the advanced technology and strategic importance of the submarine force during the Cold War era.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.