U.S. Air Force Lt. Col. Doug Miller and Lt. Col. Joe Smarsh, 77th Air Refueling Squadron pilots, complete pre-flight checks in the cockpit of a KC-135 Stratotanker on the flightline at Seymour Johnson Air Force Base, North Carolina, Dec. 5, 2019. This marks the final flight Smarsh and Miller will complete on a KC-135 Stratotanker before being trained on a KC-46 Pegasus. (U.S. Air Force photo by Staff Sgt. Mary McKnight)