original_query: What is the purpose of the phased-array radar mounted on the integrated trailer?
query: What is the purpose of the phased-array radar mounted on the integrated trailer of the G/ATOR system?
answer: The phased-array radar, part of the Radar Equipment Group (REG), is the main component of the G/ATOR system.  It's a three-dimensional, short/medium range multi-role radar designed to detect unmanned aerial systems, cruise missiles, air breathing targets, rockets, artillery, and mortars. It also performs air traffic control and fire finder roles.