Robert Lightfoot, NASA's longest-serving interim administrator, to retire

Robert Lightfoot, NASA's longest-serving interim administrator, to retire  Spaceflight Now Robert Lightfoot, NASA's Acting Administrator, to Retire as Trump's Nominee Is Stalled  New York Times NASA's acting administrator to retire without a clear successor  Chicago Tribune NASA Acting Administrator Robert Lightfoot to Retire  Popular Mechanics Who's Running NASA?  The AtlanticFull coverage

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