The Geosynchronous Space Situational Awareness Program (GSSAP) launch.

The U.S. Air Force is using a little-discussed satellite that launched in 2014 as part of ongoing experiments that look at how the Defense Department and intelligence community would act during a war in space.

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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...