NATIONAL HARBOR, MD -- The Next Generation Overheard Persistent Infrared satellites planned for launch to geosynchronous orbit will be the Space Force's final missile warning and tracking satellites deployed to that layer, the director of the Space Development Agency said today. Speaking during a roundtable at the Air and Space Force Association's Air, Space and Cyber conference, SDA Director Derek Tournear said the Space Force is looking to move away from large, expensive satellites for missile warning and tracking in...