USSSirago and anS2F-3 Tracker fromantisubmarineaircraft carrierUSS Randolph (CVS-15) in 1962
History
United States
Builder	Portsmouth Naval Shipyard,Kittery, Maine[1]
Laid down	3 January 1945[1]
Launched	11 May 1945[1]
Commissioned	13 August 1945[1]
Decommissioned	1 June 1972[1]
Stricken	1 June 1972[1]
Fate	Sold for scrap, 2 May 1973[2]
General characteristics
Class & type	Tench-classdiesel-electricsubmarine[2]
Displacement	1,570long tons (1,600 t) surfaced[2] 2,414 tons (2,453 t) submerged[2]
Length	311 ft 8 in (95.00 m)[2]
Beam	27 ft 4 in (8.33 m)[2]
Draft	17 ft (5.2 m) maximum[2]
Propulsion	4 ×Fairbanks-Morse Model 38D8-⅛ 10-cylinderopposed pistondiesel engines drivingelectrical generators[3][4] 2 × 126-cellSargobatteries[5] 2 × low-speed direct-driveElliottelectric motors[3] two propellers[3] 5,400 shp (4.0 MW) surfaced[3] 2,740 shp (2.0 MW) submerged[3]
Speed	20.25knots (38 km/h) surfaced[6] 8.75 knots (16 km/h) submerged[6]
Range	11,000 nautical miles (20,000 km) surfaced at 10 knots (19 km/h)[6]
Endurance	48 hours at 2 knots (3.7 km/h) submerged[6] 75 days on patrol
Test depth	400 ft (120 m)[6]
Complement	10 officers, 71 enlisted[6]
Armament	10 × 21-inch (533 mm)torpedo tubes (6 forward, 4 aft) 28 torpedoes[5] 1 ×5-inch (127 mm) / 25 caliber deck gun[5] Bofors 40 mm andOerlikon 20 mm cannon
General characteristics (Guppy II)
Displacement	1,870 tons (1,900 t) surfaced[7] 2,440 tons (2,480 t) submerged[7]
Length	307 ft (94 m)[8]
Beam	27 ft 4 in (8.33 m)[8]
Draft	17 ft (5.2 m)[8]
Propulsion	Snorkel added[7] Batteries upgraded toGUPPY type, capacity expanded to 504 cells (1 × 184 cell, 1 × 68 cell, and 2 × 126 cell batteries)[7]
Speed	Surfaced: 18.0 knots (33.3 km/h) maximum 13.5 knots (25.0 km/h) cruising Submerged: 16.0 knots (29.6 km/h) for ½ hour 9.0 knots (16.7 km/h) snorkeling 3.5 knots (6.5 km/h) cruising[7]
Range	15,000 nmi (28,000 km) surfaced at 11 knots (20 km/h)[8]
Endurance	48 hours at 4 knots (7 km/h) submerged[8]
Complement	9–10 officers 5 petty officers 70 enlisted men[8]
Sensors & processing systems	WFA active sonar JT passive sonar Mk 106 torpedo fire control system[8]
Armament	10 ×21 inch (533 mm)torpedo tubes  (six forward, four aft)[8] all guns removed[7]

USSSirago (SS-485), aTench-class submarine, was named for thesirago, a small, freshwater tropical fish.

Her keel was laid down on 4 January 1945 at thePortsmouth Navy Yard inKittery, Maine. She waslaunched on 13 May 1945, sponsored by Mrs.L. Mendel Rivers andcommissioned on 13 August 1945 with CommanderF. J. Harlfinger II, in command.

Commissioned at the end ofWorld War II,Sirago conducted her shakedown cruise off the East Coast and in theCaribbean Sea during the fall of 1945. After shakedown, she joined Submarine Squadron (SubRon) 8 atNew London, Connecticut, and, in January 1946, she proceeded toProvincetown, Massachusetts, where she participated in the destruction of U-BoatsU-1228, andU-805 off ofCape Cod, Massachusetts on 5 February and 8, later sinkingU-858 as well on 21 November 1947. On returning to New London,Sirago commenced duties that included training services for the Submarine School and for the fleet'sdestroyer force; experimental exercises to evaluate new techniques and equipment; type training; and fleet exercises that took her fromDavis Strait into the Caribbean. In December 1948, she entered thePhiladelphia Naval Shipyard for aGreater Underwater Propulsive Power Program (GUPPY) conversion; and, on 25 July 1949, she left the yard forNorfolk, Virginia, where, as a modernized high-speed attack submarine, she joined SubRon 6.

Attached to SubRon 6 for the next twenty-two years,Sirago’s primary mission was antisubmarine warfare. Secondary missions included antishipping warfare, intelligence gathering, and the provision of services for research and development studies. Those duties, during the 1950s, continued to see her operating primarily in the western Atlantic as she participated in exercises with others of her ASW group; in fleet exercises; in joint Canadian-United States exercises, and inNATO exercises, which took her into the easternAtlantic Ocean andNorth Sea areas. During the 1950s, she also deployed to theMediterranean Sea where she operated as a unit of theSixth Fleet from September to November 1951 and from September to December 1954.

An explosion aboardSirago while drydocked atPortsmouth, New Hampshire, on 2 June 1954, killed two men and injured four others. The blast, which occurred during plastic spraying of a main ballast tank, killed two civilian painters and injured a sailor and three other civilian painters. The burst was heard three miles away.^[9]

In October 1962,Sirago entered theNorfolk Naval Shipyard for another extensive overhaul which included the installation of a fiberglass superstructure and sail and, in the spring of 1963, she resumed operations with her ASW group, Task Group "ALFA." That fall, she deployed to theMiddle East forCENTO exercise "MIDLINK VI"; but, during the remainder of the 1960s and into the 1970s, her operations were similar to those of the 1950s.

On 1 July 1971, with Commander Clyde H. Shaffer Jr. in command,Sirago was reassigned to SubRon 12 atKey West, Florida; but, less than four months later, on 15 October, she was ordered back to Norfolk, where she rejoined SubRon 6 for one more year.

Sirago remained in SubRon 6 until she was decommissioned on 1 June 1972. Struck from theNaval Vessel Register on the same day, she was turned over to the Naval Ships Systems Command and sold for scrapping to the Jacobson Metal Company ofChesapeake, Virginia, on 2 May 1973.

 This article incorporates text from thepublic domainDictionary of American Naval Fighting Ships. The entry can be foundhere.

• Tench-class submarines
• Cold War submarines of the United States
• Ships built in Kittery, Maine
• 1945 ships

• Articles with short description
• Short description is different from Wikidata
• Wikipedia articles incorporating text from the Dictionary of American Naval Fighting Ships