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
Stricken	2 July 1973
Identification	SS-564
Fate	Transferred to Italy 10 July 1973
Italy
Name	Livio Piomarta
Commissioned	1973
Decommissioned	28 February 1986
Identification	S 515
General characteristics
Class and type	Tang-class submarine Attack 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.

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.