 Northrop Grumman developed the latest AESA radar upgrade for the F-16 (selected for USAF and Republic of China Air Force F-16 upgrades), named the Scalable Agile Beam Radar (SABR) APG-83.In July 2007, Raytheon announced that it was developing a Next Generation Radar (RANGR) based on its earlier AN/APG-79 AESA radar as a competitor to Northrop Grumman's AN/APG-68 and AN/APG-80 for the F-16.On February 28, 2020, Northrop Grumman received an order from USAF to extend the service lives of their F-16s to at least 2048 with APG-83 Scalable Agile Beam Radar (SABR) as part of the service-life extension program (SLEP).