U.S. Air Force KC-135 Stratotankers, KC-46 Pegasus and C-17 Globemaster IIIs aircraft taxi to the runway at Altus Air Force Base, Oklahoma, during a large formation exercise, May 21, 2020. During the exercise, a total of 12 KC-135s, 12 C-17s and five KC-46s were started and lined up for the elephant walk