Senior Airman Josh Martinez, a maintainer assigned to 20th Aircraft Maintenance Squadron, Shaw Air Force Base, S.C., performs preventative maintenance tasks on an F-16 CJ prior to a Red Flag 16-3 night training mission July 13, 2016 at Nellis AFB, Nev. Maintainers are responsible for overseeing the day-to-day maintenance of aircraft, including diagnosing malfunctions and replacing components, and conducting various inspections to ensure the aircraft is functioning properly. (U.S. Air Force photo by Senior Airman Joshua Kleinholz/Released)