Los Angeles-class attack submarine
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Overview
The Los Angeles-class submarine (SSN-688) represents the backbone of the U.S. Navy's attack submarine force and the most numerous nuclear submarine class in history, with 62 boats commissioned between 1976 and 1996. These fast attack submarines were designed during the Cold War to hunt Soviet nuclear submarines and secure sea lanes, featuring a revolutionary design optimized for speed and stealth in deep ocean environments. Strategically, the Los Angeles-class submarines serve as multi-mission platforms capable of anti-submarine warfare (ASW), anti-surface warfare (ASuW), intelligence gathering, special operations support, and land attack missions via Tomahawk cruise missiles. Their nuclear propulsion provides unlimited underwater endurance, allowing them to operate independently for months while maintaining high speeds exceeding 25 knots submerged. The class underwent significant evolution through three distinct flights, with later variants receiving vertical launch systems (VLS) for Tomahawk missiles and improved sonar systems. The 688I (Improved) boats feature enhanced quieting, advanced sonar arrays, and under-ice capabilities that proved crucial during Arctic operations against Soviet submarines. In today's threat environment, these submarines face challenges from advanced diesel-electric boats with air-independent propulsion, sophisticated sonar networks, and anti-submarine warfare systems deployed by near-peer competitors like China and Russia. While newer Virginia-class boats are replacing them, Los Angeles-class submarines continue operating in critical roles across the Pacific, Atlantic, and Mediterranean, with approximately 25-30 boats remaining in active service as of 2024. Their combat-proven design and Tomahawk strike capability make them valuable assets for power projection and deterrence operations.
Deployment Map
Home ports from known hull assignments. Operating areas reflect typical AORs — individual deployments will vary.
Timeline
Specifications
Armament
VLS-equipped boats only (SSN-719 and later)
Primary anti-submarine and anti-ship weapon
Tube-launched from torpedo room
Mine laying capability
Doctrine & Employment
Role
Multi-domain sea control and power projection through submarine warfare, designed to hunt Soviet nuclear submarines in the deep ocean while maintaining American naval supremacy during the Cold War.
Design Philosophy
Designers prioritized speed and deep-ocean acoustics over shallow-water maneuverability and payload flexibility, accepting a single-hull design that sacrificed survivability for hydrodynamic efficiency. The emphasis on sustained high-speed pursuit of Soviet submarines led to powerful S6G reactors but constrained internal volume for future weapons upgrades. Hull form optimized for blue-water operations rather than littoral warfare that would define post-Cold War requirements.
Employment
Typically deployed individually or in small groups for independent operations, unlike surface task forces. Primary mission profiles include anti-submarine warfare (ASW) patrols in Soviet bastions, intelligence gathering near adversary coastlines, and Tomahawk land-attack missions. Command relationships flow directly from fleet commanders, with submarines operating under EMCON for weeks while maintaining strategic mobility across ocean basins. Later variants integrated into joint strike operations as precision land-attack platforms.
Threat Context
Designed specifically to counter Soviet nuclear submarines in the GIUK gap and Pacific bastions, when submarine-versus-submarine warfare was the primary mission. The threat environment has evolved toward multi-domain littoral operations against advanced diesel-electric submarines, anti-submarine warfare by peer competitors, and integrated air-sea denial systems that challenge traditional submarine operating areas.
How to Compare
Compare on sustained submerged speed and sonar capabilities rather than weapons payload—the Los Angeles-class prioritized hunter-killer performance over strike capacity until later variants. Acoustic signature and deep-ocean endurance matter more than shallow-water agility when evaluating against Soviet and Russian contemporaries. Magazine depth became critical only after Tomahawk integration shifted the class toward land-attack missions.
Operational Patterns
Typical Deployment
Independent patrols, intelligence gathering, power projection, and hunter-killer missions
Deployment Length
6 months
Typical Task Group
Usually operate independently, occasionally with carrier strike groups
Readiness
Aging boats face increased maintenance requirements and reduced operational availability
Key Operating Areas
Peer Comparison Matrix
Akula boats are quieter and have double-hull design, but Los Angeles-class has superior sonar and combat systems. Akula has larger weapon load but less advanced fire control.
Video angle: Cold War submarine rivalry - which design philosophy proved superior in the long run?
Shang-class based on Soviet technology but newer, potentially quieter than early 688s but likely inferior to 688I boats. Limited operational experience compared to battle-tested Los Angeles-class.
Video angle: Old warrior vs new challenger - can experience overcome technological advancement?
Smaller and more specialized for European operations, excellent sonar but less multi-mission capability. No VLS system but very quiet design optimized for shallow water operations.
Video angle: Allied submarine design philosophies - specialist vs generalist approaches
Much smaller nuclear attack boat designed for Mediterranean and coastal operations. Limited endurance and weapon capacity but highly maneuverable and cost-effective for regional missions.
Video angle: Size matters - large ocean patrol boats vs compact regional defenders
Combat History
USS Louisville (SSN-724) and USS Pittsburgh (SSN-720) launched first submarine-fired Tomahawk cruise missiles in combat, striking targets in Iraq
Demonstrated submarine land-attack capability and Tomahawk effectiveness
USS Miami (SSN-755) fired Tomahawk missiles against Serbian targets during Kosovo campaign
Proved continued relevance of submarine-launched land attack capability
Multiple Los Angeles-class submarines launched Tomahawks into Afghanistan from Arabian Sea, including USS Providence and USS Key West
Showcased rapid power projection from sea-based platforms
USS Cheyenne (SSN-773), USS Montpelier (SSN-765), and USS Providence fired over 100 Tomahawks in opening strikes
Largest submarine missile salvo in naval history at the time
USS John Warner (SSN-785) - actually Virginia-class, but Los Angeles boats were involved in 2017 strikes on Shayrat airfield
Continued use in precision strike missions
Known Vulnerabilities
Acoustic signature
Earlier Flight I boats are significantly louder than modern Russian and Chinese submarines, reducing stealth advantage
Context: Advanced diesel-electric boats with AIP systems can be quieter than Los Angeles-class boats
Mitigation: Quieter 688I boats still in service, but fundamental design limitations remain
Limited weapons capacity
Only 26 weapon spaces total, forcing difficult trade-offs between torpedoes, missiles, and mines
Context: Modern threats require diverse weapon loads, but capacity constraints limit flexibility
Mitigation: Careful mission planning and weapon selection based on threat environment
Aging systems
30+ year old boats with legacy systems face increasing maintenance challenges and reduced reliability
Context: Parts obsolescence and fatigue issues affect operational availability
Mitigation: Selective upgrades and increased maintenance, but retirement is the ultimate solution
Single hull design
More vulnerable to catastrophic flooding than double-hull designs if compromised
Context: Modern anti-submarine weapons and underwater hazards pose greater risks
Mitigation: Enhanced damage control training and procedures
Variants
| Variant | Designation | Years | Count | Status | Key Changes |
|---|---|---|---|---|---|
| Flight I | SSN-688 to SSN-718 | 1976-1989 | 31 | retired | Original design with BQQ-5 sonar, no VLS, limited under-ice capability |
| 688I (Improved) | SSN-719 to SSN-750 | 1988-1995 | 23 | active | 12-cell VLS for Tomahawk, BSY-1 combat system, improved quieting, reinforced sail for under-ice operations |
| Flight III (688I Advanced) | SSN-751 to SSN-773 | 1994-1996 | 8 | active | Advanced BSY-1 combat system, improved TB-23 towed array, enhanced quieting measures |
Fleet Roster (3)
| Hull | Name | Variant | Commissioned | Home Port | Status |
|---|---|---|---|---|---|
| SSN-688 | USS Los Angeles | Flight I | 1976-11-13 | Decommissioned | retired |
| SSN-719 | USS Providence | 688I | 1985-07-27 | Groton, CT | active |
| SSN-773 | USS Cheyenne | Flight III | 1996-09-13 | Pearl Harbor, HI | active |
Modernization Programmes
ARCI (Acoustic Rapid COTS Insertion)
Upgraded sonar processing systems with commercial off-the-shelf hardware and software, improved detection capabilities
Impact: Significantly enhanced sonar processing power and detection ranges
Communications upgrades
Installation of new satellite communication systems and network capabilities for improved connectivity
Impact: Better integration with joint operations and real-time intelligence sharing
Life extension programs
Hull and mechanical upgrades to extend service life of 688I boats beyond 30 years
Impact: Extended service life to bridge capability gap until Virginia-class production increases
Retirement acceleration
Accelerated decommissioning of remaining boats as Virginia-class production ramps up
Impact: Force structure transition to more capable platforms
Images
Recent News
Frequently Asked
How many Los Angeles-class attack submarine are in service?
2 Los Angeles-class attack submarine are currently in service with United States Navy.
When was the first Los Angeles-class attack submarine commissioned?
The first Los Angeles-class attack submarine entered service in 1976-11-13.
Who builds the Los Angeles-class attack submarine?
The Los Angeles-class attack submarine is built by General Dynamics Electric Boat, Newport News Shipbuilding.
What variants of the Los Angeles-class attack submarine exist?
Known variants include: Flight I, 688I (Improved), Flight III (688I Advanced).
How much does a Los Angeles-class attack submarine cost?
Unit cost is approximately $900M per hull.
Curated Research
essential
Definitive technical and doctrinal analysis of Los Angeles-class development within Cold War submarine warfare strategy.
Comprehensive analysis of U.S. attack submarine force structure including Los Angeles-class modernization and replacement planning.
recommended
Operational context for Los Angeles-class employment during the Cold War submarine confrontation with the Soviet Navy.
Leading open-source submarine analyst providing technical updates and comparative analysis of nuclear attack submarines.
First-hand account of U.S. submarine operations and the strategic context that shaped Los Angeles-class requirements.
reference
Comprehensive technical specifications and individual boat histories for the entire Los Angeles-class program.
Modern threat context showing how peer submarine capabilities challenge traditional U.S. submarine dominance established by the Los Angeles-class.
Watch Los Angeles in Action
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