U.S. Air Force Staff Sgt. Trevor Woodruff, 100th Aircraft Maintenance Squadron flying crew chief and instrument and flight controls systems craftsman, poses for a photo with the 100th Air Refueling Wing KC-135 Stratotanker “Hundred Proof” at RAF Mildenhall, England, Feb. 8, 2019. Flying and Dedicated crew chiefs supervise pre- and post-flight actions, conduct inspections, take care of delayed and pilot-reported discrepancies and perform routine maintenance. (U.S. Air Force photo by Airman 1st Class Brandon Esau)