The cost of the U.S. Air Force’s next-generation positioning, navigation and timing satellite constellation and its associated ground network has grown by $1.1 billion in the last 12 months.

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Mike Gruss is the chief content and strategy officer at SpaceNews. From 2013 to 2016 he was a senior reporter at SpaceNews covering military space. Previously, he was editor in chief of Sightline Media Group and worked as a reporter and columnist for...