USS Greenfish (SS-351) was a submarine of the United States Navy. It was named for the greenfish. Greenfish (SS-351) was launched by the Electric Boat Co., Groton, Connecticut, 21 December 1945; sponsored by Mrs. Thomas J. Doyle; and commissioned 7 June 1946. Greenfishs shakedown cruise 22 July to 13 September 1946, took her to Barranquilla, Colombia; the Canal Zone; Callao, Peru; and St. Thomas, Virgin Islands. Exercises out of New London and in Chesapeake Bay carried her through the year, and the early months of 1947 found Greenfish back in the Caribbean for fleet exercises. On 11 February 1947 she effected one of the first transfers of personnel from an aircraft carrier, , to a submarine by helicopter. Various exercises along the American coast and in the Caribbean occupied Greenfish until 8 January 1948, when she entered the Electric Boat Co. yards for a GUPPY II conversion. This included the installation of snorkeling equipment on Greenfish, enabling her to run her diesel engines while submerged, which required the enlargement of her "sail". In addition, more batteries were installed to increase her submerged speed and permit the ship to remain completely submerged for longer periods. Returning to New London 21 August 1948, Greenfish sailed on her "second" shakedown cruise 1 September, with Rear Admiral James J. Fife, Commander, Submarine Force, Atlantic Fleet, aboard. She transited the Panama Canal 9 September and engaged in exercises at Balboa before returning to New London 24 September. The new GUPPY submarine was attached to the Pacific Fleet, and sailed for Pearl Harbor 23 October. She reached her new home 25 November 1948. With the exception of ASW and harbor defense exercises in Puget Sound in 1950 and a subsequent Mare Island overhaul, Greenfish operated out of Pearl Harbor on local exercises through 1951. Departing Pearl Harbor 15 November 1951, Greenfish sailed to Yokosuka, Japan, for Korean War duty. After a patrol 31 January to 1 March 1952, She participated in exercises at Okinawa and then returned to Hawaii 2 June. Local and special operations filled her time until 5 November 1954, when she entered the Pearl Harbor Shipyard for another modernization overhaul. Greenfish, overhaul completed 6 July 1955, sailed for deployment with the 7th Fleet 15 September and reached Yokosuka 29 September. From 19 October to 15 November she engaged in special operations, and then embarked on a tour of Southeast Asia. Ports visited by