Secretary of the Air Force Heather Wilson arrives on the flightline at Kabul Air Wing Aug. 17, 2017, in Kabul, Afghanistan. Wilson travelled to Kabul to meet Airmen assigned to Train, Advise, Assist Command-Air who work side-by-side with their Afghan counterparts as they expand operational capabilities of the Afghan Air Force. (U.S. Air Force photo by Staff Sgt. Alexander W. Riedel)