Airman 1st Class Chayce Ardoin, 57th Aircraft Maintenance Squadron Lightning Aircraft Maintenance Unit crew chief, talks into his headset at Nellis Air Force Base, Nevada, July 23, 2018. Crew chiefs use headsets to communicate to each other and the pilot, during pre- and post-flight checks. (U.S. Air Force photo by Airman 1st Class Andrew D. Sarver)