WASHINGTON — The Pentagon awarded RTX a $45.3 million contract modification to support U.S. military GPS satellite ground operations, even as officials weigh scaling back the troubled Next Generation Operational Control System program known as OCX.

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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...