WASHINGTON — It’s a question that lawmakers on Capitol Hill have been asking the Pentagon for years: Are the command-and-control systems between the president and the nation’s nuclear forces totally secure and defendable from cyber or electronic attacks?

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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...