Brig. Gen. Paul W. Tibbets IV, 509th Bomb Wing commander, greets Gen. Paul J. Selva, 10th Vice Chairman of the Joint Chiefs of Staff, Aug. 21, 2015 at Whiteman Air Force Base, Mo. Selva is the nation’s second highest-ranking military officer. (U.S. Air Force photo by Senior Airman Joel Pfiester/Released)