OVERVIEW: The SSN 771 *Columbia* [Improved *Los Angeles* Class] is a nuclear-powered fast attack submarine of the United States Navy, commissioned in 2021. It represents a significant upgrade to the earlier *Los Angeles* class, incorporating advanced sensor suites, improved stealth characteristics, and enhanced combat capabilities.

DETAILS: The *Columbia*, while designated an "Improved *Los Angeles* Class", represents a substantive evolution in submarine design, driven by lessons learned from the Cold War and the evolving threat landscape of the 21st century. The design retains the proven hull form of the *Los Angeles* class but integrates advanced noise reduction technologies, including improved anechoic coatings and a redesigned propeller. The upgrade focused heavily on enhancing the submarine's ability to operate in littoral environments, a capability increasingly vital given the shift in naval operations towards coastal regions. This necessitated improved sonar performance in shallow water and enhanced communication systems for networked warfare. The *Columbia's* construction also emphasized modular design, facilitating future upgrades and technology insertions throughout its operational lifespan.

The *Columbia* is primarily designed for anti-submarine warfare (ASW), anti-surface warfare (ASuW), and intelligence, surveillance, and reconnaissance (ISR) missions. Its advanced sensor suite allows for the detection and tracking of even the quietest modern submarines. The Mk45 VLS system provides a significant strike capability against land targets using Tomahawk cruise missiles, extending the submarine's role beyond traditional naval combat. Furthermore, the *Columbia's* ability to operate covertly in hostile waters makes it an ideal platform for special operations forces delivery and support. The AN/BLQ-10(V)2 Electronic Support Measures (ESM) system provides comprehensive situational awareness by detecting, identifying, and geolocating radar and communication signals.

The *Columbia's* sensor suite provides unparalleled situational awareness. The AN/BQQ-10 sonar system, a wide-aperture array, offers exceptional long-range detection and classification capabilities. The towed array sonars, AN/TB-29A and AN/TB-34, further enhance its ASW capabilities by detecting faint acoustic signatures at extended ranges. The AN/WLR-9A acoustic intercept receiver detects and analyzes hostile sonar transmissions, providing early warning of potential threats. The Mk67 torpedo tubes are capable of launching a variety of 533mm weapons, including the Mk48 Advanced Capability (ADCAP) torpedo. The incorporation of both optical and LLTV periscopes improves situational awareness in littoral environments and increases the survivability of the submarine. The AN/BPS-15A radar provides surface search and navigation capabilities. The installation of the AN/BQS-15 close-range sonar allows for enhanced navigation in congested or shallow waters, minimizing the risk of collision or grounding. The CSA Mk2 Mod 4 Countermeasure system provides a defensive capability against torpedo attacks.

SPECIFICATION: Length: 109.7 m || Beam: 10.1 m || Draft: 9.75 m || Disp: 6330 t

SENSORS: AN/TB-29A || AN/BLQ-10(V)2 || AN/WLR-9A || AN/BPS-15A || AN/BQS-15 || AN/BQQ-10 || AN/TB-34 || Generic Submarine Periscope, Optical || Generic Submarine Periscope, LLTV

ARMAMENT: 3-inch Signal Ejector || CSA Mk2 Mod 4 [Mk151] || Mk45 VLS [12 Cells] || 533mm Mk67 TT