Advanced Gun System

Advanced Gun System
Name	Advanced Gun System
Origin	United States
Type	Naval artillery
Designer	BAE Systems (BAE Systems Land & Armaments), General Dynamics
Design date	1990s
Manufacturer	BAE Systems, Northrop Grumman, Lockheed Martin
Produced	2000s
Number	2 (installed)
Caliber	155 mm
Rate	10–12 rounds/min (theoretical)
Range	83–110+ nautical miles (with specialized projectiles)
Traverse	360°

Advanced Gun System

The Advanced Gun System is a US Navy shipboard 155 mm naval gun developed for Zumwalt-class destroyers by a consortium including BAE Systems, General Dynamics, and Raytheon. Conceived during the late Cold War and Post–Cold War modernization efforts, it was intended to provide long-range naval surface fire support for United States Navy expeditionary operations, supporting forces such as I Marine Expeditionary Force, United States Marine Corps amphibious assaults, and littoral maneuver campaigns. Program milestones intersected with programs and entities such as Office of Naval Research, Naval Sea Systems Command, Congressional Budget Office, and defense acquisition reforms across the administrations of Bill Clinton, George W. Bush, and Barack Obama.

Design and Development

The gun emerged from requirements defined by United States Fleet Forces Command, Chief of Naval Operations, and Office of the Secretary of Defense to replace traditional naval gunfire exemplified by 5-inch/54 caliber gun systems, leveraging technology from projects like Extended Range Guided Munition and research in Electromagnetic Railgun and GPS-guided artillery. Prime contractors including BAE Systems, General Dynamics Land Systems, Northrop Grumman and Lockheed Martin collaborated with shipbuilder Bath Iron Works and Ingalls Shipbuilding on integration into the Zumwalt-class destroyer hull form developed by BAE Systems Surface Ships and Huntington Ingalls Industries. Key stakeholders such as Congress, the Government Accountability Office, and the Chief of Naval Operations (CNO) influenced budget decisions, while program offices within Naval Sea Systems Command managed testing at ranges like White Sands Missile Range and facilities run by Naval Surface Warfare Center.

Technical Specifications

The system is an enclosed, automated, turret-mounted 155 mm/62-caliber gun with an autoloader and magazine handling systems designed for high salvo rates and reduced crew exposure, integrating sensors and combat systems such as Aegis Combat System interfaces, AN/SPY-3 family sensors, and shipboard power and cooling provided by Integrated Power System (IPS) architecture used aboard Zumwalt-class destroyer. Fire-control integration required coordination with Naval Strike and Air Warfare Center, Joint Fires doctrine, and precision navigation inputs from Global Positioning System and inertial navigation such as Honeywell systems. The hull-mounted magazine—designed to carry Long Range Land Attack Projectile rounds—required novel handling machinery similar to systems developed by Autoloaders manufacturers and paralleled work in 155 mm artillery automation by Nexter and BAE Systems Land Systems.

Ammunition and Munitions Types

The Advanced Gun System was paired with specialized munitions, notably the Long Range Land Attack Projectile (LRLAP), a rocket-assist, GPS-guided 155 mm projectile designed for ranges exceeding conventional naval gunfire, drawing on guidance technology akin to M712 Copperhead and Excalibur guided artillery. Development involved contractors such as Raytheon, BAE Systems, and munition manufacturers with experience from programs like Precision Guided Munitions and Joint Direct Attack Munition. Alternate ammunition concepts explored included guided submunitions, extended-range base bleed shells, and non-lethal payloads evaluated in studies by Center for Naval Analyses and RAND Corporation. Cost growth in LRLAP paralleled budget controversies seen in programs like F-35 Lightning II and prompted consideration of commonality with Army 155 mm families such as M982 Excalibur.

Operational History and Deployment

Operational deployment was limited to the two commissioned Zumwalt-class destroyers that received the system, with shipboard trials conducted in coordination with United States Pacific Fleet and Naval Surface Forces Atlantic units. Acceptance testing and live-fire events involved ranges such as White Sands Missile Range and Pacific Missile Range Facility and coordination with fleet commands including Third Fleet and Fifth Fleet. Strategic debates over role and cost occurred in forums led by Senate Armed Services Committee, House Armed Services Committee, and analyses by the Government Accountability Office and Congressional Research Service.

Performance, Limitations, and Failures

While the gun demonstrated high firing rates and integration with Zumwalt sensors, practical limitations emerged: prohibitive munition unit costs for LRLAP, constrained magazine capacity due to Zumwalt-class shipboard volume, and evolving threat environments emphasizing missile and air defense challenges addressed by systems like Phalanx CIWS and RIM-162 ESSM. The cancellation of procurement quantities mirrored issues in programs such as Littoral Combat Ship mission module debates and raised questions about cost-effectiveness compared with alternatives like Tomahawk (missile) strike, naval aviation from USS Gerald R. Ford (CVN-78) air wings, and future concepts including Electromagnetic Railgun and hypersonic strike. Congressional oversight and cost analyses by CBO highlighted programmatic risk, influencing decisions by Secretary of the Navy and service leadership.

Modifications, Upgrades, and Successor Programs

Following munition procurement problems, the Navy explored retrofit options, life-extension work coordinated with contractors like BAE Systems and General Dynamics Ordnance and Tactical Systems, and potential conversion to alternative munitions such as standardized 155 mm rounds or integration with common guided projectiles like Excalibur. Workstreams considered lessons from Zumwalt-class power systems for future directed-energy weapons and integration with successor programs including Future Surface Combatant concepts and research pursued at Office of Naval Research and Naval Sea Systems Command laboratories. Debates about reutilizing hulls, adapting magazines for missile cells like Vertical Launch System variants, or repurposing energy and space for laser weapon systems continue among stakeholders including Chief of Naval Operations, Secretary of Defense, and Congressional committees.

Category:Naval artillery Category:United States Navy weapons