A United Launch Alliance Vulcan rocket launched the Space Force mission USSF-87 in February 2026. Credit: United Launch Alliance

WASHINGTON — The U.S. Space Force is exploring whether it can resume flights of United Launch Alliance’s Vulcan rocket without using the solid rocket boosters now under investigation, a workaround that could allow some missions to proceed even as the vehicle remains grounded for national security launches.

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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...