WASHINGTON — The Missile Defense Agency awarded Northrop Grumman, Raytheon, Leidos and L3Harris each a $20 million contract to design space sensors that can track hypersonic and ballistic missiles, the agency announced Oct. 29.

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Sandra Erwin writes about military space programs, policy, technology and the industry that supports this sector. She has covered the military, the Pentagon, Congress and the defense industry for nearly two decades as editor of NDIA’s National Defense...