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Lockheed Martin is transitioning the Sentinel A4 radar to full-rate production (FRP) after delivering the first unit to the US Army. The Sentinel A4, designed to replace the legacy Sentinel A3 radar, features a 360-degree Active Electronically Scanned Array (AESA) sensor and shows over a 75% increase in range.

The radar can detect small targets at ranges up to 35 km and adds capabilities against Rocket, Artillery, and Mortar (RAM) threats. The US Army awarded the contract for the Sentinel A4 in 2019, with the first unit completed in August 2022. The Army is currently testing the system at White Sands Missile Range, and further deliveries are planned as production ramps up.