USS San Antonio (LPD-17)

USS San Antonio (LPD-17)

The USS San Antonio (LPD-17) is the lead ship of the San Antonio class, representing the U.S. Navy’s latest generation of amphibious transport docks. Commissioned in January 2006, she serves as a flexible platform designed to embark, transport, and land elements of a Marine Expeditionary Unit (MEU) by air, surface, and subsurface assets. Her advanced hull form, signature-reduction features, and integrated combat systems make her a versatile asset for expeditionary warfare, humanitarian assistance, and disaster relief operations.

Design and Development

Mission Profile

• Transport up to 800 Marines and their equipment.
• Embark and operate landing craft air cushion (LCAC), conventional landing craft, and amphibious assault vehicles.
• Embark, launch, recover, and maintain helicopters, MV-22 Osprey tiltrotors, and unmanned aerial vehicles (UAVs).
• Provide command, control, communications, computers, intelligence, surveillance, and reconnaissance (C4ISR) facilities.

Signature Reduction

• Enclosed bow blowers, angled superstructure panels, and infrared-suppressive exhaust stacks.
• Shallow hull topography minimizes radar cross section.
• Acoustic dampening measures reduce hull noise for submarine-detection avoidance.

Hull and Dimensions

Hull Form

• Steel monohull with bulbous bow for improved seakeeping and fuel efficiency.
• Flared hull sides to deflect spray and improve stability.

Key Dimensions

• Length overall: 684 feet (208.5 m)
• Beam: 105 feet (32 m)
• Draft: 23 feet (7 m)
• Displacement (full load): approximately 25,000 long tons

Propulsion and Performance

Machinery Plant

• Combined diesel and gas (CODAG) configuration:
  1. Two Rolls-Royce MT30 gas turbines (each 36 MW)
  2. Two Colt-Pielstick diesel engines (each 8,200 hp)
• Two shafts with controllable-pitch propellers

Performance

• Maximum speed: 22+ knots
• Range: 7,000 nautical miles at 15 knots
• Endurance: 90 days sustained operations without replenishment

Armament and Defense Systems

Gun Systems

• One Mk 45 Mod 2 5-inch/62-caliber naval gun
• Two 30 mm Mk 46 remote-weapon stations

Close-In and Missile Defense

• Rolling Airframe Missile (RAM) launcher, 21 cells
• Two Phalanx Block 1B Close-In Weapon Systems (CIWS)
• Decoy launchers: SRBOC chaff and AN/SLQ-32(V) electronic warfare suite

Aviation Facilities

Flight Deck

• Full-width flight deck capable of simultaneous operations of two CH-53E helicopters or MV-22B Ospreys.
• Touch-and-go spots for UAV operations.

Hangar and Support

• Enclosed hangar with maintenance shops, aviation fuel storage (JP-5), and helicopter traversing system.
• Supports up to four medium helicopters or two tiltrotors plus unmanned assets.

Sensors and Electronic Systems

Radar and Sonar

• SPS-48E 3D air search radar
• SPS-73 surface search/navigation radar
• SQQ-89A(V)15 anti-submarine warfare combat system

Combat Management

• Aegis-derived command and control consoles
• Integrated Bridge System with voyage management, track-while-scan, and automatic identification system (AIS)

Crew and Accommodations

Ship’s Company

• Officers: 28
• Enlisted personnel: 340

Embarked Forces

• Marine complement: up to 800 (including air-crew)
• Vehicle stowage: 500 square meters of mission bay
• Cargo handling: two 60-ton electro-hydraulic cranes

Habitability

• Modular berthing with adjustable bunks
• Fitness room, medical/dental clinic, galleys, and chapel

Survivability and Damage Control

Structural Protection

• Double-bulkhead compartmentalization
• Torpedo and mine impact mitigation features

Damage Control Systems

• Digital centralized control for firemain, dewatering, and ventilation
• Automated firefighting foam monitors in machinery spaces
• Multiple damage-control lockers and EEBD (emergency escape breathing devices)

Operational Capabilities

Amphibious Assault

• LCAC well deck: two hovercraft or one conventional landing craft per side-by-side operation
• Stern gate and side port ramp for rapid deployment of amphibious vehicles

Humanitarian Assistance

• Large vehicle and cargo stowage areas configurable for relief supplies
• Extensive fresh water production: 90,000 gallons per day
• Medical facilities: operating room, ICU, and triage spaces

Modernization and Upgrades

Combat Systems

• Ongoing integration of Cooperative Engagement Capability (CEC) for networked air defense
• Upgraded AN/SLQ-32(V)6 with advanced electronic attack modes

Propulsion and Auxiliary

• Energy-saving devices (e.g., pre­swell–hull appendages)
• Improved CORROSION-resistant coatings to reduce maintenance

Technical Specifications Summary

Conclusion

The USS San Antonio (LPD-17) redefines modern amphibious warfare by blending robust command facilities, advanced signature management, and flexible mission configurations. Her balanced combination of transportation capacity, defensive systems, and automation makes her a cornerstone of expeditionary strike group operations for decades to come.