USS Haddock (SSN-621), was the last Thresher/Permit-class submarine to be built. She was also the third ship of the United States Navy to be named after the haddock, a large species of fish.

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History
United States
Name	USS Haddock
Namesake	The haddock, a large fish
Awarded	24 August 1960
Builder	Ingalls Shipbuilding, Pascagoula, Mississippi
Laid down	24 April 1961
Launched	21 May 1966
Sponsored by	Mrs. Thomas G. Morris
Commissioned	22 December 1967
Decommissioned	7 April 1993
Stricken	7 April 1993
Homeport	San Diego, later Pearl Harbor, Hawaii
Honors and awards	2 Vietnam Service Medals, Armed Forces Expeditionary Medal, Battle "E" Award.
Fate	Entered Ship-Submarine Recycling Program, 1 October 2000; recycling completed 1 October 2001
General characteristics
Class and type	Thresher/Permit-class submarine
Displacement	3,770 LT (3,830 tonnes) surfaced 4,300 long tons (4,369 t) submerged
Length	279 ft (85 m)
Beam	31 ft 8 in (9.65 m)
Propulsion	S5W PWR
Complement	100 officers and men
Armament	4 × 21 in (533 mm) torpedo tubes

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The contract to build her was awarded to Ingalls Shipbuilding in Pascagoula, Mississippi on 24 August 1960 and her keel was laid down on 24 April 1961. She was launched on 21 May 1966, sponsored by Mrs. Corinne (Steven) Morris, wife of Representative Thomas G. Morris of New Mexico who had served on USS Sealion (SS-195) before WWII, and commissioned on 22 December 1967 with Commander Stanley J. Anderson in command.

Commissioned in December 1967, Haddock underwent sea trials in the Gulf of Mexico.^[1] She transited the Panama Canal between January and February of 1968,^[2] arriving and being drydocked at Puget Sound Naval Yard in the spring of 1968. She was assigned to Submarine Squadron 3 in late 1968 and arrived at her first homeport, San Diego, in 1969. Following a deployment to the Western Pacific, her home port was transferred to Pearl Harbor in time for her first overhaul, which was completed in 1972. Haddock was awarded the Meritorious Unit Commendation for significant achievements during her next deployment.

This section needs expansion with: history for 1972–1977. You can help by adding to it. (February 2013)

Haddock underwent a resupply and refit in 1973 in her new homeport in Hawaii.

In 1977, Haddock had a 19-month overhaul in Mare Island, following which she was restationed in San Diego, and reassigned to Submarine Squadron Three.

This section needs expansion with: history for 1977–1983. You can help by adding to it. (February 2013)

In early 1981, Haddock participated in Ready Ex-81. Haddock completed her seventh deployment to the Western Pacific on 23 December 1983. She then went to Mare Island in October 1984 for her third overhaul and returned to San Diego and Submarine Squadron Three in February 1987. Haddock earned the Battle Efficiency "E" Award for fiscal year 1988.

This section needs expansion with: history for 1988–1991. You can help by adding to it. (February 2013)

Haddock deployed to the Western Pacific for the eleventh time from July to October 1991.

History needed for 1991–1993.

This section needs expansion with: history for 1991–1993. You can help by adding to it. (February 2013)

Haddock was decommissioned and struck from the Naval Vessel Register on 7 April 1993. Ex-Haddock entered the Nuclear Powered Ship and Submarine Recycling Program on 1 October 2000. Recycling was completed on 1 October 2001.