The US Department of Defense is moving forward with plans to integrate the Patriot Advanced Capability-3 Missile Segment Enhancement (PAC-3 MSE) interceptor into the Aegis Combat System to strengthen missile defense for US Navy destroyers.
Inside Defense reports that $65 million has been allocated in the fiscal year 2026 mandatory budget for the effort. Lockheed Martin, co-developer of the Patriot system, has long pursued this integration, with the new funding representing the first concrete step toward deploying the interceptor aboard naval vessels.
The PAC-3 MSE has been tested with the Aegis system’s AN/SPY-1 radar, a key component of its command-and-control architecture. Current efforts also focus on ensuring compatibility with the Mk 41 Vertical Launch System, installed on surface combatants including Arleigh Burke-class destroyer ships.
In 2024, a PAC-3 MSE interceptor was successfully launched from a containerized platform to engage a cruise missile, marking the first vertical launch using a virtualized Aegis against a live target. Integrating the interceptor with the Mk 41 system could provide a cost-effective deployment option, requiring minimal modifications to existing ship infrastructure.
The PAC-3 MSE would add an additional defensive layer to Aegis-equipped vessels, which currently rely on Standard Missile variants including SM-2, SM-3, SM-6, and the RIM-162 Evolved SeaSparrow Missile. As a hit-to-kill interceptor, it is capable of countering a wide range of threats, including ballistic missiles, cruise missiles, hypersonic weapons, and aircraft.
The missile has a range of approximately 120 kilometers and an engagement altitude near 36 kilometers, making it highly effective against tactical ballistic missile threats.
This integration effort coincides with a ramp-up in PAC-3 MSE production. Under a January agreement between Lockheed Martin and the Pentagon, annual output is projected to grow from about 600 missiles to nearly 2,000 over seven years. The interceptor is currently in service with 17 partner nations, including Bahrain, Poland, and Ukraine.
