WASHINGTON — The Pentagon is considering allowing United Launch Alliance (ULA) to launch a mass simulator on its next Vulcan Centaur rocket flight if its planned payload, Sierra Space’s Dream Chaser, is not ready by year’s end, according to a defense official.

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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...