Master Sgt. Ron Harris, assigned to the 307th Maintenance Squadron, checks for leaks on two engines of a B-52 Stratofortress prior to performing an engine run on Barksdale Air Force Base, La. June 29, 2017. All eight Pratt and Whitney Turbofan Engines are carefully inspected before the bomber is returned to service after a phase inspection. (U.S. Air Force photo by Master Sgt. Dachelle Melville/Released)