Albert McPherson, 20th Aircraft Maintenance Squadron Air Force engineering and technical services equipment specialist shift lead, tightens screws on the vertical stabilizer of an F-16 Fighting Falcon at Shaw Air Force Base, S.C., Sept. 11, 2018. McPherson secured the screws to ensure the wing maintains structural integrity during flight. (U.S. Air Force photo by Airman 1st Class Benjamin Ingold)