U.S. Air Force Tech Sgt. Jeremy Mayfield, 52nd Maintenance Squadron engine technician, left, and Staff Sgt. Joseph Livingston, 52nd Maintenance Group maintenance training instructor, begin a pre-flight inspection on an F-16 Fighting Falcon, Dec. 9, 2020, at Spangdahlem Air Base, Germany. Mayfield and Livingston were part of an Agile Combat Employment course where the students learned crew chief responsibilities, such as launch, recovery and refueling. (U.S. Air Force photo by Senior Airman Melody W. Howley)