Blue Origin’s BE-4 engines power the first stage of United Launch Alliance's Vulcan rocket. Credit: ULA

WASHINGTON — The U.S. Space Force is bracing for delays in launching key national security payloads aboard United Launch Alliance’s (ULA) Vulcan rocket, Lt. Gen. Philip Garrant, head of the Space Force’s Space Systems Command, said Nov. 21 during a meeting with reporters.

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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...