Airman Zachary McGlone, 361st Training Squadron aerospace propulsion apprentice course student, works on an aircraft engine at Sheppard Air Force Base, Texas, Oct. 3, 2018. McGlone is tightening all the safety wires that secure the parts inside the engine. Multiple safety wires, some in hard to reach spots deep in the engine, must be secured correctly or the parts may become loose while the aircraft is in flight. (U.S. Air Force photo by Airman 1st Class Pedro Tenorio)