U.S. Air Force Staff Sgt. Irang K. McClellan, Staff Sgt. Jose A. Reyes and Airman 1st Class Edwin Rodriguez, all 911th Air Refueling Squadron (ARS) dedicated crew chiefs, stand in the distance as they conduct pre-flight checks before takeoff from Seymour Johnson Air Force Base, North Carolina, Dec. 12, 2019. The 911 ARS prepared for their final mission in KC-135 Stratotanker. (U.S. Air Force photo by Staff Sgt. Mary McKnight)