A group of seven U.S. senators have pushed back against an Air Force plan to halve the number of launches to be competitively awarded under the service’s primary satellite launching program from 2015 through 2017.

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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...