180322-F-YK359-1114
U.S. Air Force Senior Airman Johnathan Vollbrecht, a 354th Maintenance Squadron propulsion flight jet engine intermediate maintenance technician, tightens a bolt while working on an F-16 Fighting Falcon engine March 22, 2018, at Eielson Air Force Base, Alaska. Eielson's propulsion flight conducts preventative maintenance, routine maintenance and diagnoses and fixes problems with aircraft engines, allowing jets to attain more flying hours. (U.S. Air Force photo by Airman 1st Class Isaac Johnson)