U.S. Air Force Senior Master Sgt. Jeffrey Zimmerman, 75th Aircraft Maintenance Unit superintendent, assigned to Moody Air Force Base, Ga., guides U.S. Air Force Gen. Herbert “Hawk” Carlisle, commander of Air Combat Command, as he prepares to takeoff on his final flight at Joint Base Langley-Eustis, Va., March 9, 2017. Carlisle has logged more than 3,600 flight hours in numerous air frames throughout his career. (U.S. Air Force photo/Airman 1st Class Derek Seifert)