U.S. Secretary of Defense, Dr. Mark T. Esper, bids a socially-distant farewell to Col. Matthew Calhoun, 131st Bomb Wing commander, at Whiteman Air Force Base, Missouri, July 22, 2020. Esper visited Whiteman to engage with Airmen and senior leaders in order to get a firsthand understanding of the operations and support of the B-2 Spirit stealth bomber. (U.S. Air Force photo by Senior Airman Thomas Barley)