Los Angeles-class submarine (Improved)
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| Los Angeles-class submarine (Improved) | |
|---|---|
| Name | Los Angeles-class submarine (Improved) |
| Type | Nuclear-powered attack submarine |
| Builder | Newport News Shipbuilding; General Dynamics Electric Boat |
| Introduced | 1980s |
| Service | United States Navy |
| Primary user | United States Navy |
| Number built | 31 (Improved variants) |
| Displacement | approx. 6,900 tonnes submerged |
| Length | 110 m |
| Beam | 10 m |
| Propulsion | S6G reactor; steam turbine; pump-jet (varied) |
| Armament | Torpedoes; Tomahawk cruise missiles; Harpoon missiles (some) |
| Sensors | BQS-series sonar; TB-16; AN/BYG-1 sonar suite |
| Speed | 20+ knots submerged (classified estimates) |
Los Angeles-class submarine (Improved) The Los Angeles-class submarine (Improved) represents the enhanced follow-on group of the Los Angeles-class submarine family deployed by the United States Navy during the late Cold War and post–Cold War eras. Designed to advance undersea warfare capabilities, the Improved boats integrated upgraded sonar arrays, quieter machinery, and expanded Tomahawk strike capacity to counter Soviet Navy challenges and support US power projection. These submarines operated alongside surface combatants like the Arleigh Burke-class destroyer and carriers such as the Nimitz-class aircraft carrier in contested regions including the North Atlantic and Western Pacific.
Design and Development
The Improved design emerged from requirements set by the Chief of Naval Operations and the Naval Sea Systems Command to replace older Sturgeon-class submarine limitations and to respond to advances by the Soviet Navy's Akula-class submarine and Typhoon-class submarine programs. Naval architects at Electric Boat and Newport News Shipbuilding incorporated lessons from the SUBSAFE program and trial results from experimental platforms including USS Glenard P. Lipscomb (SSN-685) and research by Naval Undersea Warfare Center. Collaboration with the Defense Advanced Research Projects Agency influenced acoustic quieting and materials choices, while procurement decisions were coordinated with the Office of the Secretary of Defense and congressional oversight committees such as the House Armed Services Committee.
Technical Specifications
Improved boats used reactors based on the S6G reactor architecture with steam turbines and direct-drive or pump-jet options informed by trials on USS Seawolf (SSN-21) and USS Jimmy Carter (SSN-23). Hull form drew from research at the Naval Surface Warfare Center and the David Taylor Model Basin; the pressure hull employed HY-80 steel standards set after assessments following USS Thresher (SSN-593) and USS Scorpion (SSN-589). Electronics centered on the AN/BYG-1 combat system, integrating inertial navigation from Sperry Corporation and signal processing advances from Raytheon. Acoustic signature reductions echoed methods described in Acoustic Research Laboratory studies and NATO interoperability standards used during exercises like Ocean Safari and RIMPAC.
Armament and Sensor Systems
Armament fit included 533 mm torpedo tubes for MK-48 ADCAP torpedoes and compatibility with UGM-109 Tomahawk cruise missiles launched from vertical launch systems retrofitted on some hulls; earlier boats retained Harpoon missile capability. Sensors combined spherical and flank arrays evolved from the BQQ-5/BQS series and towed-array systems similar to TB-16; sonar processing drew on heritage from AN/UYK-43 computing modules and later integrated processors by General Dynamics. Fire control interfaced with weapon control doctrines refined with the Naval Submarine School and validated during trials with platforms such as USS Honolulu (SSN-718).
Operational History
Improved Los Angeles boats saw service in Cold War intelligence collection missions against the Soviet Northern Fleet and patrols in the Barents Sea, supporting strategic surveillance for commands including U.S. European Command and U.S. Pacific Fleet. High-profile deployments included visits and joint exercises with allies such as Royal Navy units during Operation Ocean Venture and cooperation with Royal Australian Navy elements in the Coral Sea. Post-Cold War operations shifted to strike missions in support of Operation Iraqi Freedom and Operation Enduring Freedom, where Tomahawk volleys were coordinated with USS Eisenhower (CVN-69) carrier strike groups and B-52 Stratofortress bomber sorties.
Variants and Modifications
The Improved subset followed early 21 and 688I designations, with successive hulls incorporating pump-jet trials and vertical launch capability influenced by Seawolf-class submarine developments. Mid-life upgrades introduced combat system overhauls to AN/BYG-1 Baseline versions, sonar improvements inspired by Advanced Deployable System research, and habitability changes aligned with standards from the Navy Personnel Command. Modifications for special missions were applied to conversions similar in purpose to USS Parche (SSN-683) clandestine modifications, although Improved boats typically remained multi-mission attack submarines.
Construction and Deployment
Construction schedules were negotiated among General Dynamics Electric Boat, Newport News Shipbuilding, the Naval Sea Systems Command, and supply chains including firms like Northrop Grumman and Rolls-Royce Marine for auxiliary systems. Keel-laying, christening, and commissioning events were often attended by officials from the Department of the Navy and members of Congress representing shipyard districts. Improved units were homeported at bases including Naval Base Kitsap, Naval Submarine Base New London, and Pacific facilities around Pearl Harbor, supporting rotational deployments to the Western Pacific and NATO waters.
Crew and Habitability
Crews were trained at the Naval Nuclear Power Training Command and the Naval Submarine School with career pathways managed by the Navy Personnel Command and overseen by commanding officers who graduated from institutions like the United States Naval Academy or Naval Postgraduate School. Habitability improvements reflected standards from naval studies performed by the Naval Research Laboratory and included enhanced berthing, galley upgrades, and exercise facilities to support prolonged patrols influenced by lessons from long-duration cruises of USS Bremerton (SSN-698). Medical readiness was coordinated with Fleet Surgical Teams and occupational safety followed guidance from the Occupational Safety and Health Administration for shipboard contexts.