USS Wyoming (SSBN-742)

USS Wyoming (SSBN-742)

USS Wyoming (SSBN-742) is the fourth Ohio-class ballistic missile submarine in the United States Navy. Designed as a seaborne leg of nuclear deterrence, Wyoming combines massive strike capability with stealthy hull design and extended submerged endurance. Since her commissioning in July 1996, she has maintained continuous at-sea deterrent patrols, projecting strategic stability through her complement of Trident II D-5 missiles.

Namesake and Commissioning

Honoring the State of Wyoming

Wyoming carries the name of the 44th U.S. state, celebrated for its rugged landscapes and expansive skies. Her crest features a mountain silhouette beneath a banner that reads “Force Must Yield to Law,” reflecting both the natural resilience of her namesake and the submarine’s role in upholding national security under the rule of law.

Construction Milestones

The contract to build Wyoming was awarded to General Dynamics Electric Boat in October 1989. Her keel was laid on 8 August 1991 at Groton, Connecticut. After nearly four years of modular assembly and outfitting, Wyoming slid into the Thames River on 15 July 1995. Formal commissioning took place at Naval Submarine Base Kings Bay, Georgia, on 13 July 1996, where she remains home-ported.

Hull Design and Stealth Features

Pressure Hull and Outer Hull

Wyoming’s pressure hull is fabricated from HY-80 high-strength steel, formed into rolled sections welded in longitudinal and circumferential seams. Encasing this inner hull is an outer light hull, creating a hydrodynamic shape that minimizes drag at high speed. The gap between the two hulls houses ballast tanks used for precise buoyancy control during dives and ascents.

Acoustic Signature Reduction

To achieve ultra-quiet operation, Wyoming’s hull exterior is coated with anechoic tiles that absorb incoming sonar pings. Machinery mounts inside the pressure hull float on noise-damping shock absorbers. All rotating equipment, from pumps to piping, follows strict vibration-isolation standards. These measures suppress detectable noise, making Wyoming exceptionally stealthy during silent patrols.

Propulsion and Power Generation

Nuclear Reactor Plant

At the heart of Wyoming’s propulsion system is a single S8G pressurized-water reactor fueled by highly enriched uranium. The reactor produces steam for two geared steam turbines rated at a combined 60,000 shaft horsepower. A separate 325-horsepower auxiliary electric motor supports ultra-quiet, low-speed operations and emergency maneuvering.

Power Distribution and Endurance

Electrical power is routed through redundant switchboards to support navigation, combat systems, life-support, and auxiliary loads. Nuclear propulsion grants Wyoming effectively unlimited range and endurance, limited primarily by food supplies and crew stamina. Typical deterrent patrols extend for 70 to 90 days submerged before rotating crews.

Armament and Strategic Payload

Ballistic Missile Tubes

Wyoming carries 24 vertical launch tubes loaded with Trident II D-5 submarine-launched ballistic missiles. Each missile reaches targets over 7,000 nautical miles away and can deliver multiple independently targetable reentry vehicles (MIRVs). Tube hatches close flush with the hull, preserving the submarine’s low drag profile.

Self-Defense Torpedo System

For close-in defense and undersea combat, four bow-mounted 533 mm torpedo tubes fire Mk 48 advanced capability heavyweight torpedoes. Integrated fire-control software links sonar contacts to torpedo guidance, enabling rapid engagement of hostile submarines or surface ships.

Sensor, Navigation, and Combat Systems

Sonar Arrays

Wyoming’s sensor suite centers on the BQQ-5 hull-mounted spherical sonar, augmented by a passive towed array stored in a fairwater compartment aft of the sail. The combination allows long-range detection of quiet adversary submarines and pings appropriate fire-control solutions to the combat system.

Navigation and Communications

Inertial navigation systems paired with global positioning sensors provide precise undersea positioning. Extremely low frequency (ELF) and very low frequency (VLF) antennas enable one-way communication from shore for mission updates while remaining submerged. Satellite communications and periscope-mounted datalinks support surface operations when security protocols permit.

Crew Organization and Habitability

Dual-Crew Rotation

To maximize patrol availability, Wyoming operates with two complete crews—Blue and Gold—that alternate every 70 to 90 days. Each crew comprises approximately 155 personnel, including 15 officers and 140 enlisted submariners, ensuring the boat remains on patrol with minimal downtime.

Living Spaces and Life-Support

Internal layouts divide the submarine into 26 pressure-tight compartments. Berthing spaces employ stacked rack bunks, while a mess area, galley, and small exercise station support crew welfare. Air revitalization systems scrub carbon dioxide, inject oxygen, and remove particulates, sustaining habitability for prolonged submerged operations.

Operational History

Since joining the fleet, Wyoming has completed numerous strategic deterrent patrols in the Atlantic and Mediterranean. She has participated in missile-test launches, multinational naval exercises, and readiness evaluations. A mid-life refueling overhaul in 2018 updated combat electronics and extended her service life into the 2040s.

Technical Specifications