Staff Sgt. Brandon Thompson, 22nd Maintenance Squadron KC-135 Stratotanker crew chief, removes screws from a KC-135 upper outward aileron lockout panel during an isochronal inspection Dec. 2, 2020, at McConnell Air Force Base, Kansas. During the examination, Airmen expose internal elements by de-paneling the aircraft, which allows them to thoroughly investigate the tanker. The isochronal inspection can take up to 3 weeks to complete. (U.S. Air Force photo by Senior Airman Alan Ricker)