USS San Juan (SSN-751), a Los Angeles-class submarine, is the third ship of the United States Navy to be named San Juan, though only the second named for San Juan, Puerto Rico. The contract to build her was awarded to the Electric Boat Division of General Dynamics Corporation in Groton, Connecticut on 30 November 1982 and her keel was laid down on 9 August 1985. She was launched on 6 December 1986 sponsored by Mrs. Sherrill Hernandez, wife of VADM Diego E. Hernández,^[4] and commissioned on 6 August 1988.

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USS San Juan (SSN-751)

USS San Juan in the Atlantic Ocean, 29 August 2023
History
United States
Name	San Juan
Namesake	The City of San Juan, Puerto Rico
Awarded	30 November 1982
Builder	General Dynamics Electric Boat
Laid down	9 August 1985
Launched	6 December 1986
Sponsored by	Mrs. Sherrill Hernandez
Commissioned	6 August 1988
Homeport	Naval Submarine Base New London
Identification	21312[1] MMSI number: 369970217 Callsign: NSJP
Motto	Technology and Tradition
Status	In active service
Badge
General characteristics
Class and type	Los Angeles-class submarine
Displacement	5,790 long tons (5,883 t) light 6,197 long tons (6,296 t) full 407 long tons (414 t) dead
Length	110.3 m (361 ft 11 in)
Beam	10 m (32 ft 10 in)
Draft	9.4 m (30 ft 10 in)
Installed power	nuclear
Propulsion	1 × S6G PWR nuclear reactor with D2W core (165 MW), HEU 93.5%[2][3] 2 × steam turbines (33,500) shp 1 × shaft 1 × secondary propulsion motor 325 hp (242 kW)
Speed	Classified
Complement	12 officers, 98 men
Sensors and processing systems	BSY-1 sonar suite combat system
Armament	4 × 21 in (533 mm) torpedo tubes 12 × vertical launch Tomahawk missiles

Close

During the early evening of 13 March 2007, units of the USS Enterprise Carrier Strike Group (CSG) received a series of indications that USS San Juan (SSN-751), a Los Angeles-class submarine conducting pre-deployment training with the Enterprise CSG, was in distress.^[5]

The submarine established communications in the early morning hours of 14 March, and indicated that there were no problems; hence, units were able to stand down from the search and rescue that was already well underway.^[5]

San Juan was the first of the Flight III or 688i for "improved" design, that received a number of significant improvements to the previous boats in the class. San Juan and all subsequent boats in her class are quieter and incorporate an advanced AN/BSY-1 sonar suite combat system. Another improvement includes the ability to lay mines from their torpedo tubes. San Juan's sail was also strengthened, enabling the ability to break through ice.^[6]

• Battle E – 30 September 1991
• Battle E – 30 September 1992
• Battle E – 30 September 1994
• Navy Unit Commendation – 1 July 1994
• Meritorious Unit Commendation – 1 July 1997
• Meritorious Unit Commendation – 10 December 1998
• Battle E – 31 December 2002
• Armed Forces Expeditionary Medal – 31 March 2003
• Meritorious Unit Commendation – 5 October 2005
• Meritorious Unit Commendation – 22 November 2009^[12]
• Battle E – 8 January 2010^[13]
• Battle Effectiveness Award – 12 January 2017^[14]