The Los Angeles class has been the backbone of the U.S. attack submarine force for roughly 40 years.
That simple fact explains why these boats still matter. Designed in the Cold War and first deployed in the 1970s, the class remains deeply embedded in the Navy’s undersea posture even as newer Virginia-class submarines continue to enter service. The official Navy fact file still describes approximately 24 now in commission, a remarkable figure for a design that has already outlasted several shifts in naval doctrine, sensors, and missile technology. What keeps the class relevant is not nostalgia. It is modernization.
The improved 688i Los Angeles-class boats feature an all-digital Mk 1 Combat Control System, replacing older approaches with a combat suite better suited to contemporary undersea operations. That upgrade expanded how the submarines process sonar data, track contacts, and manage weapons employment. In technical language preserved by the Federation of American Scientists, “The CSS (Combat Control System) internal tracker model provides processing for both towed array and spherical array trackers.” That matters because the Los Angeles class was never just about speed and stealth. Its value has always rested on how quickly it can turn acoustic detections into targeting-quality information while remaining far ahead of the force it is screening.
The weapons fit reinforces that role. Navy records note that Los Angeles boats from SSN 719 and later carry VLS tubes for launching Tomahawk cruise missiles, while the class also fields MK 48 torpedoes through its four torpedo tubes. In practice, that gives the submarine a wide mission set: anti-submarine warfare, anti-surface warfare, strike, surveillance support, and battle group screening. The same Navy reference outlines that attack submarines are built to support battle group operations, and that mission remains central to understanding why the class has stayed in front-line use.
Another less visible reason these boats have endured is updated computing systems, keeping them interoperable with newer submarines and the fleet networks gradually replacing them. The addition of Tactical Advanced Computer-3 processors gave the 688i force a more modern computing backbone, improving interoperability with systems associated with the Virginia and Columbia programs. That kind of alignment matters in a force structure that increasingly depends on shared data, common interfaces, and faster tactical handoffs between platforms. A submarine built around Cold War hull architecture can still contribute to a much newer operational ecosystem when its internal systems are kept current.
The class is also a help bridge a transitional period in the submarine force. The Navy continues to commission Virginias 24 so far while retirements gradually shrink the Los Angeles-class inventory. A 2026 retirement notice stated that the inactivation of Newport News and Alexandria would reduce the force to 18 Los Angeles-class boats. This transition is not just swapping old submarines for new; it’s about maintaining sufficient undersea capacity amid production and operational pressures.
For that reason, one word still fits the class better than any slogan: enduring. Not because the submarines are permanent, and not because they are unchanged, but because they have remained useful across generations of technology, strategy, and fleet design.
