WASHINGTON — The U.S. Space Force awarded Northrop Grumman a $1.8 billion contract extension to begin production of two advanced early warning satellites designed to detect missile threats, particularly those approaching from the Northern Hemisphere.

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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...