WASHINGTON — Lockheed Martin is challenging the prevailing narrative that military users of the Global Positioning System (GPS) are dangerously vulnerable to service disruptions and is emphasizing the advanced security features set to debut with the upcoming GPS IIIF satellites.

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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...