This is a new facility for Northrop Grumman in Rancho Bernardo, updated to serve the company and clients as a large indoor electromagnetic test range, for doing radar cross sections and other EM wave profiling of test objects. It is one of a handful of large indoor EM ranges in Southern California, used in place of outdoor ranges, where anechoic baffles can be used to neutralize reflections and limit outside interference, and observation. The building was acquired when Northrop Grumman purchased Orbital ATK in 2018. It is one of a dozen or so buildings that Northrop Grumman’s Aeronautics Systems division uses here to develop its unmanned aircraft systems like the Global Hawk, Bat, and Firebird, as well as other autonomous systems, radar systems, and electronic warfare systems.