Retired astronaut engages Schriever Airmen Published Aug. 6, 2018 By Staff Sgt. Matthew Coleman-Foster 50th Space Wing Public Affairs SCHRIEVER AIR FORCE BASE, Colo. -- Retired NASA astronaut, Peggy Whitson, speaks with Schriever Airmen during a meet and greet luncheon in the Satellite Dish dining facility at Schriever Air Force Base, Colorado, July 31, 2018.