Lt. Col. Jacob Parker, 350th Air Refueling Squadron commander, boards a KC-135 Stratotanker after performing an external preflight inspection Oct. 15, 2020, at McConnell Air Force Base, Kansas. The preflight inspection is a visual check to verify the integrity of the aircraft and ensure all aircraft pins and covers are removed. (U.S. Air Force photo by Senior Airman Alexi Bosarge)