Members of the 20th Aircraft Maintenance Squadron, Shaw Air Force Base, S.C., walk off the flightline after performing an end-of-runway check on three F-16 Fighting Falcons during Red Flag 15-3 at Nellis Air Force Base, Nev., July 13, 2015. Red Flag sorties are typically flown twice a day, a pace that tests both the crews in the air and the maintenance professionals on the ground charged with keeping aircraft in the fight.