Photos show modular build progress on US Columbia-class SSBN-826

New construction photos of the Columbia-class ballistic missile submarine USS District of Columbia (SSBN-826) highlight design and build features such as an X-shaped stern control plane arrangement, updated quieting/propulsion and control-surface electronics, and new sonar/sensor suites. While not a battlefield-frontline innovation, it represents a significant next-generation strategic naval platform with improved survivability and sensing compared to Ohio-class SSBNs.