Staff Sgt. Ashley Grugin, a maintainer assigned to the 20th Aircraft Maintanence Squadron, Shaw Air Force Base, S.C., changes a landing gear tire on an F-16 Fighting Falcon during Red Flag 15-4 at Nellis Air Force Base, Nev., Aug. 19, 2015. Maintainers are responsible for and dedicated to overseeing the day-to-day maintenance of aircraft. (U.S. Air Force photo by Airman 1st Class Mikaley Towle)