U.S. Air Force Gen. Herbert “Hawk” Carlisle, commander of Air Combat Command, goes over a preflight maintenance check with U.S. Air Force Senior Master Sgt. Jeffrey Zimmerman, 78th Aircraft Maintenance Unit superintendent, prior to his final flight at Joint Base Langley-Eustis, Va., March 9, 2017. Zimmerman was Carlisle’s first crew chief and was invited to lead the general’s final launch. (U.S. Air Force photo/Staff Sgt. Natasha Stannard)