U.S. Air Force Airman 1st Class Aaron Haar, 52nd Maintenance Squadron non-destructive inspection apprentice, reads the technical order manual at Spangdahlem Air Base, Germany, May 8, 2018. T.O. manuals provide clear and concise instructions for the safe and effective operation and maintenance of Air Force military systems. (U.S. Air Force photo by Airman 1st Class Jovante Johnson)