WASHINGTON — Northrop Grumman said it delivered its first 21 satellites for the U.S. Space Force’s proliferated low Earth orbit constellation, putting the company in line to join York Space Systems and Lockheed Martin in deploying the military’s space-based data network.

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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...