Secretary of the Air Force Barbara M. Barrett and former Secretary of the Air Force Heather Wilson unveils Wilson’s official portrait during a ceremony at the Pentagon in Arlington, Va., July 28, 2020. Wilson served as secretary from May 16, 2017 to May 31, 2019, during a time of transition for the Air Force. The service moved from an era defined by combatting terrorism to confronting emerging powers such as Russia and China. (U.S. Air Force photo by Wayne Clark)