WASHINGTON — The U.S. Space Force awarded SpaceX a $4.16 billion contract to build a constellation of satellites designed to track airborne targets from orbit, marking one of the Pentagon’s biggest bets yet on shifting battlefield surveillance missions from aircraft to space.

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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...