NATIONAL HARBOR, Md. — Even with dozens or hundreds of sensor satellites in orbit to spot incoming weapons, U.S. military leaders say defending against the most advanced missile threats will require capabilities to disrupt these attacks “left of launch.”

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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...