WASHINGTON — Lockheed Martin is stepping up its argument that the U.S. military’s GPS constellation is becoming more resilient, even as military leaders warn publicly about rising jamming and spoofing threats and lawmakers debate alternatives to satellite-based positioning, navigation and timing.

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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...