ORLANDO, Fla. — In a move to differentiate itself from rival SpaceX, United Launch Alliance (ULA) is proposing a new military application for its Vulcan Centaur rocket: a “space interceptor” capable of thwarting potential threats to U.S. assets in orbit.

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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...