USS Haddock (SSN-621)

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.

[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.

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.

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.

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.