WASHINGTON — Castelion, a defense technology startup led by former SpaceX engineers, announced Dec. 5 it raised $350 million in Series B financing to accelerate high-volume production of hypersonic weapons for the Pentagon. 

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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...