Patriot PAC-3

The United States' premier long-range air-and-missile defense system — a road-mobile, layered SAM and lower-tier BMD platform that combines blast-fragmentation and hit-to-kill interceptors to defeat aircraft, cruise missiles, and tactical ballistic missiles, and the cornerstone of Western integrated air defense.

Overview

The Patriot PAC-3 (MIM-104) is a long-range, mobile surface-to-air missile system fielded by the United States and a wide network of allies. It provides theater air and missile defense by pairing a phased-array engagement radar with multiple interceptor types on common launchers. Its PAC-3 variant, built around hit-to-kill interceptors, is optimized for ballistic-missile defense and has demonstrated the ability to engage hypersonic aeroballistic threats. More than 100 batteries are estimated to serve across NATO, with additional operators in the Middle East and Asia; Ukraine has acquired roughly six batteries since 2023.

Development

Raytheon (now RTX) developed the original Patriot as an anti-aircraft system, which entered U.S. Army service in 1984. The pivotal upgrade came with the Patriot Advanced Capability-3 (PAC-3) program, led by Lockheed Martin. The PAC-3 interceptor made its first service entry around 2001, introducing a hit-to-kill kill vehicle to defeat tactical ballistic missiles. The enhanced PAC-3 Missile Segment Enhancement (MSE) followed, reaching operational capability in 2016, with a larger dual-pulse motor and greater defended footprint. According to Army Recognition, the M903 launcher can carry up to 12 MSE or 16 PAC-3 CRI rounds, offering substantial magazine depth.

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