U.S. Air Force Gen. Herbert “Hawk” Carlisle, commander of Air Combat Command, greets U.S. Air Force Senior Master Sgt. Jeffrey Zimmerman, 75th Aircraft Maintenance Unit superintendent, assigned to Moody Air Force Base, Ga., before his final flight at Joint Base Langley-Eustis, Va., March 9, 2017. Zimmerman served as Carlisle’s former crew chief at Langley Air Force Base when they served together in the late 1990’s. (U.S. Air Force photo/Airman 1st Class Derek Seifert)