WASHINGTON - The U.S. Navy has awarded Lockheed Martin a contract to develop, integrate, and test the Patriot Advanced Capability-3 Missile Segment Enhancement (PAC-3 MSE) interceptor within the Aegis Combat System, expanding the Navy’s layered air and missile defense architecture.
The effort will integrate PAC-3 MSE, currently fielded by the U.S. Army and partner nations, into the Aegis fire control environment for the first time, providing U.S. Navy warships with an additional terminal-layer, hit-to-kill intercept capability alongside the Standard Missile family.
Lockheed Martin did not disclose a fixed contract value but described the award as a multi-million-dollar effort supporting broader missile integration and production acceleration activities tied to PAC-3 MSE deliveries in 2026. The company said the work builds on prior internal investment and earlier demonstrations that established baseline technical compatibility between PAC-3 MSE and the Aegis combat architecture.
Related: Army asks Lockheed Martin to build PAC-3 air defense missiles equipped with radar and inertial guidance
Systems integration
At a systems level, the integration connects two distinct air and missile defense architectures. Aegis is a shipboard, software-defined command-and-control system built around phased-array radar tracking, real-time sensor fusion, and fire control management. PAC-3 MSE is a highly maneuverable, hit-to-kill interceptor designed for terminal-phase engagements using onboard radar guidance and thrust-vectoring control.
Within the Aegis architecture, sensor data from shipboard radars and offboard sources is fused into fire-control-quality tracks that support engagement decisions. The system then assigns interceptors based on threat geometry, timing constraints, and probability-of-intercept calculations, coordinating launch and midcourse guidance via the ship’s Mk 41 Vertical Launch System.
PAC-3 MSE completes the engagement chain in the terminal phase using its active seeker and high-agility control system to execute direct-impact kinetic intercepts. The missile relies on external cueing and midcourse updates before transitioning to autonomous terminal guidance in the final seconds of flight.
Related: Navy asks Raytheon for technology upgrades to Aegis combat systems aboard Navy and allied destroyers
Integrating PAC-3 MSE into Aegis requires aligning fire control data formats, engagement timing, and interceptor cueing logic across two systems originally designed for different basing environments. The result effectively expands Aegis’ interceptor portfolio downward into a shorter-range, high-agility terminal defense layer.
Aegis background
The Navy’s Aegis combat system, deployed across cruisers and destroyers, already coordinates multiple interceptor types, including SM-2, SM-3, and SM-6 missiles. The addition of PAC-3 MSE expands engagement flexibility against maneuvering cruise missiles, ballistic threats and emerging high-speed systems in constrained engagement windows.
Officials said the integration effort includes engineering development, software integration and system testing to validate compatibility with Aegis baselines and the Mk 41 Vertical Launch System.
In parallel, the Department of Defense (DoD) has awarded Lockheed Martin a separate contract to accelerate production of PAC-3 MSE interceptors. That effort is part of a broader initiative to expand missile production capacity and replenish inventories across U.S. and allied forces.
Together, the integration and production efforts reflect a broader DoD push to expand integrated air and missile defense capacity across domains by combining naval battle management systems with high-agility kinetic interceptors originally developed for ground-based defense networks.
No timeline for operational deployment was disclosed.
