WASHINGTON — Sierra Space said it has signed national security and commercial customers to fly payloads on the first orbital mission of its Dream Chaser spaceplane, as the long-delayed vehicle moves toward a debut flight later this year.

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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...