Test of an X-Bow Systems additively manufactured solid propellant. Credit: X-Bow Systems

WASHINGTON — The Pentagon on Sept. 26 announced three contracts aimed at beefing up U.S. production of solid rocket motors (SRMs), a part of the defense industrial base officials say is vulnerable to supply-chain disruption and under pressure from rising demand.

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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...