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Lockheed Martin has begun transitioning the Sentinel A4 radar from low-rate initial production to full-rate production, having delivered the first unit to the US Army. Designed to replace the legacy Sentinel A3 radar, the new system features a 360-degree AESA sensor and enhances detection capabilities against airborne threats, including rockets and drones. The US Army has been testing the radar, with full-rate production expected to follow the planned delivery of 19 units in the current production phase.