WASHINGTON — The U.S. Space Force selected four companies to develop concepts for smaller, more cost-effective GPS satellites based on commercial designs, aiming to augment the existing Global Positioning System network, the Department of the Air Force announced Sept. 23.

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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...