Crew chief pre-flight checks
U.S. Air Force Senior Airman Andy Bui, 355th Aircraft Maintenance Squadron A-10C Thunderbolt II crew chief, communicates with an A-10 pilot assigned to the 354th Fighter Squadron, on the flightline at Davis-Monthan Air Force Base, Ariz., June 23, 2016. The 355th AMXS provides safe and properly configured aircraft in order to meet mission requirements for three squadrons. (U.S. Air Force photo by Airman 1st Class Mya M. Crosby/Released)