US Navy accepts accelerated delivery of final Flight IIA destroyer USS Patrick Gallagher.

The U.S. Navy has accepted the future USS Patrick Gallagher (DDG-127), the final Flight IIA Arleigh Burke-class destroyer, more than two months ahead of schedule, marking the end of the SPY-1 radar generation of U.S. destroyer production. Announced on May 28, 2026, the delivery strengthens fleet readiness by giving the crew additional time for training and certification while closing a nearly three-decade evolution of the Flight I and Flight IIA destroyer lineage.

As the last Arleigh Burke built around the AN/SPY-1D radar and Aegis Flight IIA combat system, USS Patrick Gallagher preserves a proven multi-mission configuration capable of ballistic missile defense, air defense, strike warfare, and anti-submarine operations from a single platform. Its delivery also highlights the transition to Flight III destroyers equipped with the AN/SPY-6 radar, a shift that will expand the Navy’s air and missile defense capability while increasing the complexity of future ship construction and integration.

Related topic: USS Patrick Gallagher begins sea trials as last US Navy Arleigh Burke-class Flight IIA destroyer

The USS Patrick Gallagher is the final Flight IIA Technology Insertion destroyer, a variant introduced in 2016 to incorporate updated computing architecture and combat system improvements while retaining the SPY-1D radar and Aegis system. (Picture source: US Navy)

On May 28, 2026, the U.S. Navy accepted an accelerated delivery of the future USS Patrick Gallagher (DDG-127) from General Dynamics Bath Iron Works in Bath, Maine, concluding the Flight IIA Technology Insertion chapter of the Arleigh Burke-class destroyer program more than two months ahead of schedule. The delivery is notable not only because the USS Patrick Gallagher becomes the 77th Arleigh Burke-class destroyer transferred to the fleet, but also because it is the final ship constructed with the AN/SPY-1D radar and Aegis Flight IIA combat system architecture before production shifts entirely to Flight III destroyers.

The ship, therefore, closes a production lineage that evolved through Flight I, Flight II, Flight IIA, Flight IIA Restart, and Flight IIA Technology Insertion variants over nearly three decades. Ordered on September 28, 2017, fabricated from November 2018, laid down on March 30, 2022, and christened on July 27, 2024, the USS Patrick Gallagher required nearly nine years from contract award to delivery. Once commissioned, the destroyer will be based in Norfolk, Virginia, joining a U.S. Navy that continues to rely heavily on Arleigh Burke-class destroyers as its principal multi-mission surface combatants. 

The accelerated delivery resulted from a decision to fundamentally alter the final testing sequence rather than reduce testing requirements. Sea trials began on April 27, 2026, when the ship departed Bath Iron Works via the Kennebec River. During the following weeks, propulsion systems, electrical generation, ship control systems, combat systems, and auxiliary machinery were tested through a consolidated builder's trial process that merged events traditionally conducted separately. The ship underwent propulsion evaluations using its four General Electric LM2500 gas turbines, which together produce approximately 100,000 shaft horsepower.

Trials included speed runs, maneuverability assessments, endurance testing, steering evaluations, and integrated system operation under combined loads. By reducing the interval between test events and shortening the period normally allocated to post-trial corrections, Bath Iron Works (BIW) and the U.S. Navy were able to advance delivery by more than sixty days. The practical consequence is that the future crew gains additional time for combat system certification, training, and qualification activities before the USS Patrick Gallagher officially enters operational service. The ship's position within the broader Arleigh Burke-class program is significant because it sits at the intersection of two generations of destroyer construction.

The USS Patrick Gallagher is the final Flight IIA Technology Insertion destroyer, a variant introduced in 2016 to incorporate updated computing architecture and combat system improvements while retaining the established SPY-1D radar and Aegis system. Unlike the USS Jack H. Lucas (DDG-125) and the USS Louis H. Wilson Jr. (DDG-126), which were incorporated into Flight III procurement, the USS Patrick Gallagher (DDG-127) remained within the Flight IIA family. This decision allowed the U.S. Navy to continue receiving mature and fully integrated destroyers while Flight III development matured.

As a result, the USS Patrick Gallagher serves as the last representative of a configuration whose combat system, radar architecture, and shipboard arrangements have already accumulated decades of operational experience across dozens of vessels. The ship effectively marks the endpoint of the SPY-1 generation of Arleigh Burke destroyers before the fleet begins relying increasingly on Flight III units. At full load, the USS Patrick Gallagher displaces approximately 9,217 tonnes, measures 156 meters in length and 20 meters in beam, and accommodates a crew of roughly 380 personnel.

Its primary combat capability is built around the Aegis weapon system and AN/SPY-1D radar, supported by a 96-cell Mk 41 Vertical Launch System (VLS) divided between a 32-cell forward battery and a 64-cell aft battery. Those launch cells can accommodate a broad mix of weapons, including SM-2 missiles for area air defense, SM-3 interceptors for ballistic missile defense, SM-6 missiles for long-range air and missile engagements, Evolved Sea Sparrow Missiles for point and local area defense, Tomahawk cruise missiles for land attack and Vertical Launch ASROC weapons for anti-submarine warfare.

Unlike many surface combatants designed around a single mission area, the DDG-51 architecture allows the same ship to conduct ballistic missile defense, air defense, strike warfare, and anti-submarine warfare without altering its basic configuration. This flexibility remains one of the principal reasons the class continues to be produced nearly four decades after the first ship was ordered by the US Navy on April 2, 1985. The Flight IIA configuration introduced capabilities absent from earlier Arleigh Burke variants, particularly in the field of anti-submarine warfare. The USS Patrick Gallagher incorporates dual helicopter hangars and support facilities capable of sustaining two MH-60R Seahawk helicopters simultaneously.

Earlier Flight I and Flight II ships lacked these permanent hangars, limiting aviation operations during extended deployments. The embarked helicopters significantly increase the destroyer's surveillance radius and provide additional anti-submarine warfare reach through airborne sensors, sonobuoys and torpedoes. Shipboard anti-submarine capability is further strengthened by two triple Mk 32 torpedo launchers compatible with Mk 46, Mk 50, and Mk 54 lightweight torpedoes. Combined with Vertical Launch ASROC missiles carried in the Mk 41 launch system, the destroyer can engage submarine threats at multiple ranges using several different weapon types. Surface warfare and naval fire support missions are performed by a 5-inch/62 Mk 45 naval gun, while point defense against incoming threats is provided by the Phalanx Close-In Weapon System (CIWS) and Mk 38 gun mounts.

The overall configuration allows simultaneous anti-air, anti-surface, and anti-submarine operations within U.S. carrier strike groups or independent deployments. The USS Patrick Gallagher also represents the final Arleigh Burke-class constructed around the SPY-1 radar family, which has equipped these destroyers since the class entered service in 1991. Every subsequent destroyer currently under construction for the U.S. Navy will be completed to the Flight III standard and equipped with the AN/SPY-6 Air and Missile Defense Radar. The transition involves substantially more than a radar replacement. The SPY-6 required increased electrical generation capacity, expanded cooling systems and associated modifications throughout the ship.

These changes were implemented to support a radar designed to improve detection, tracking and discrimination performance against ballistic missiles, cruise missiles, and smaller aerial targets. The U.S. Navy has already ordered 23 Flight III destroyers as the future core of the Arleigh Burke-class destroyer force structure. Bath Iron Works is currently building the USS William Charette (DDG-130), USS Quentin Walsh (DDG-132), USS John E. Kilmer (DDG-134), and USS Richard G. Lugar (DDG-136), all of which incorporate the Flight III configuration and therefore face more demanding integration requirements than the USS Patrick Gallagher. 

The delivery also carries implications for the U.S. naval industrial base. Arleigh Burke production remains divided between Bath Iron Works in Maine and Huntington Ingalls Industries' Ingalls Shipbuilding division in Mississippi, the only two shipyards currently producing the class. The DDG-51 program has remained in continuous production since 1988, making it one of the longest-running surface-combatant acquisition programs in U.S. history. Bath Iron Works currently holds contracts for eleven destroyers, including seven already under construction and four not yet started. The accelerated completion of DDG-127 therefore provides a useful indicator of what can be achieved on a mature production line with an established design, experienced workforce, and combat system already fielded across the fleet.

Whether the same schedule gains can be achieved on Flight III destroyers remains uncertain. Unlike the USS Patrick Gallagher, those ships incorporate the SPY-6 radar, expanded electrical generation, upgraded cooling systems, and more complex integration work. The key measure of sustained improvement will not be the delivery of Patrick Gallagher itself, but whether upcoming ships such as DDG-130, DDG-132, and DDG-134 demonstrate similar reductions in the time required to move from construction through sea trials and delivery. A single accelerated delivery demonstrates that schedule compression is possible, but repeated accelerated deliveries across multiple Flight III hulls would indicate a broader change in Arleigh Burke destroyer production performance.

Written by Jérôme Brahy

Jérôme Brahy is a defense analyst and documentalist at Army Recognition. He specializes in naval modernization, aviation, drones, armored vehicles, and artillery, with a focus on strategic developments in the United States, China, Ukraine, Russia, Türkiye, and Belgium. His analyses go beyond the facts, providing context, identifying key actors, and explaining why defense news matters on a global scale.

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