OVERVIEW: The SSBN 627 James Madison is a nuclear-powered ballistic missile submarine (SSBN) of the James Madison class, operated by the United States Navy. Commissioned in 1978, she represents a significant iteration in the US Navy's strategic deterrence program.

DETAILS:
The James Madison class of SSBNs were developed as a direct follow-on to the Lafayette class, incorporating significant improvements in nuclear propulsion and missile technology. The primary design driver was the integration of the Poseidon C3 missile, a substantial upgrade over the Polaris A3 previously deployed. This required modifications to the submarine's hull and internal structure to accommodate the larger missile and its associated systems. The James Madison class represented a key component of the United States' Cold War strategic nuclear triad, providing a survivable and retaliatory strike capability. Emphasis was placed on acoustic quieting technologies to reduce detectability by Soviet anti-submarine warfare (ASW) assets. The James Madison was specifically built to meet the escalating naval arms race and provide credible nuclear deterrence.

The primary role of the James Madison was strategic nuclear deterrence, achieved through the deployment of submarine-launched ballistic missiles (SLBMs). She was designed to operate independently and covertly for extended periods, patrolling designated areas to ensure a near-invulnerable second-strike capability. While primarily a strategic asset, the vessel also possesses self-defense capabilities. While not optimized for anti-submarine warfare (ASW) or anti-surface warfare (ASuW), the James Madison was capable of detecting and engaging threats if necessary, utilizing her sensors and torpedoes. These vessels were a crucial part of the US Navy's efforts to maintain a balance of power during the Cold War and deter potential aggression.

The James Madison possessed a comprehensive suite of sensors to support its strategic mission and self-defense. The AN/BQS-4 active/passive sonar served as the primary means of underwater detection, providing long-range detection capabilities. The AN/BQR-7, AN/BQR-15, AN/BQR-19, and AN/BQR-21 passive sonar arrays enhanced the submarine's ability to detect and classify distant contacts while maintaining acoustic silence. The AN/WLR-8(V)2 and AN/WLR-9 electronic support measures (ESM) systems provided awareness of radar emissions from surface ships and aircraft, allowing the submarine to evade detection. The AN/BPS-15A surface search radar was used for navigation and surface contact detection when surfaced. A generic optical periscope and a low-light television (LLTV) periscope facilitated visual observation. For self-defense, the vessel was equipped with 533mm Mk65 torpedo tubes. The CSA Mk1 FED [Mk139] fire control system allowed the submarine to effectively employ its torpedo armament. The 3-inch signal ejector provided a means for communication. The Poseidon C3 missile formed the principal strike component.

SPECIFICATION: Length: 129.6 m || Beam: 10.0 m || Draft: 9.6 m || Disp: 7370 t

SENSORS: AN/WLR-8(V)2 || AN/BQR-15 || AN/BPS-15A || AN/BQS-4 || AN/BQR-7 || AN/BQR-21 || AN/BQR-19 || AN/WLR-9 || Generic Submarine Periscope, Optical || Generic Submarine Periscope, LLTV

ARMAMENT: Poseidon C3 || 3-inch Signal Ejector || CSA Mk1 FED [Mk139] || 533mm Mk65 TT