Airman 1st Class Shane de-Guzman and Airman Jacob Newcomer, 362nd Training Squadron crew chief apprentice course students, install an axel nut on the right main landing gear tire on an F-16 Falcon at Sheppard Air Force Base, Texas, Feb. 6, 2018. De-Guzman and Newcomer are in block eight of nine and scheduled to graduate March 6. (U.S. Air Force photo by Alan R. Quevy)