USS Trigger (SS-564)

History
United States
Name:	USS Trigger
Builder:	Electric Boat Company
Laid down:	24 February 1949
Launched:	14 June 1951
Commissioned:	31 March 1952
Decommissioned:	2 July 1973
Struck:	2 July 1973
Identification:	SS-564
Fate:	Sold to Italy
Italy
Name:	Livio Piomarta
Commissioned:	1973
Decommissioned:	28 February 1986
Identification:	S515
General characteristics
Class and type:	Tang-class submarine
Displacement:	1,615 long tons (1,641 t) surfaced 1,990 long tons (2,022 t) submerged
Length:	269 ft (82 m)
Beam:	27 ft (8.2 m)
Draft:	17 ft (5.2 m)
Speed:	18.3 knots (21.1 mph; 33.9 km/h) surfaced 15.5 knots (17.8 mph; 28.7 km/h) submerged
Complement:	88 officers and men
Armament:	8 × 21 inch (533 mm) torpedo tubes (6 forward, 2 aft)

USS Trigger (SS-564), a Tang-class submarine, was the second ship of the United States Navy to be named for the triggerfish, any of numerous deep-bodied fishes of warm seas having an anterior dorsal fin with two or three stout erectile spines.

Her keel was laid down on 24 February 1949 at Groton, Connecticut, by the Electric Boat Company. She was launched on 14 June 1951 sponsored by Mrs. Roy S. Benson, and commissioned on 31 March 1952 with Commander Edward L. Beach in command.

Following shakedown training off Rio de Janeiro, Brazil, the attack submarine returned to her home port, New London, Connecticut, and participated in local operations for the remainder of the year. She was back in the Caribbean Sea in February, returned to New London on 28 March, and continued East Coast operations until 16 August 1957. She then joined submarine Nautilus and proceeded to the Arctic Ocean. The submarine spent ten days at the ice pack in the north Greenland Sea and made several short trips under the ice pack. From 16 September to 1 October, she participated in the North Atlantic Treaty Organisation (NATO) Operation "Strikeback". She then called at Portland, England and Le Havre, France, en route back to New London to resume normal operations.

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