TOBYHANNA ARMY DEPOT, Pa. - Electronics Mechanic Roberto Colon De Jesus overhauls an AN/TPN-19 Landing Control Central (Radar Set) power supply here. The AN/TPN-19 is a complete Radar Approach Control (RAPCON) or Ground Control Approach (GCA) facility used by air traffic controllers to identify, sequence and separate participating aircraft; provide final approach guidance, and guidance through air defense corridors and zones. Data from the radars is monitored by air traffic controllers working in the operations shelter. To overhaul a system, Tobyhanna employees completely disassemble it, send components to support shops for repair, make any necessary modifications and test it. Workload often includes diagnosing electrical failures and replacing defective components, testing and repairing all internal wiring and cable harnesses, and blasting, cleaning, priming and complete repainting of the asset. Colon De Jesus works in the Intelligence, Surveillance and Reconnaissance Directorate's Air Traffic Control Division. Tobyhanna Army Depot is the Defense Department's largest center for the repair, overhaul and fabrication of a wide variety of electronics systems and components, from tactical field radios to the ground terminals for the defense satellite communications network. Tobyhanna's missions support all branches of the Armed Forces. About 3,500 personnel are employed at Tobyhanna, which is located in the Pocono Mountains of northeastern Pennsylvania.