WASHINGTON — Lockheed Martin’s proposed $4.4 billion acquisition of rocket engine manufacturer Aerojet Rocketdyne has been blocked by the Federal Trade Commission, the agency announced Jan. 25. 

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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...