WASHINGTON — X-Bow Systems, a startup that builds solid rocket motors, has raised an additional $35 million in Series B funding, bringing the round’s total to $105 million. The latest tranche was led by Lockheed Martin Corp., which also entered a strategic agreement with the company.

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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...