Secretary of the Air Force Barbara Barrett and former Secretary of the Air Force Heather Wilson unveil 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 in which the service moved from an era defined by combating terrorism to confronting emerging powers such as Russia and China. (U.S. Air Force photo by Wayne Clark)