GPS III SV-08 satellite. Credit: Lockheed Martin.

WASHINGTON — SpaceX is gearing up to launch a Global Positioning System satellite for the U.S. military on May 30 from Cape Canaveral Space Force Station, Florida, marking another high-profile national security mission that shifted from United Launch Alliance’s Vulcan to the Falcon 9 rocket.

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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...