Air Force Chief of Staff Gen. David L. Goldfein talks with Barbara M. Barrett before she takes the administrative oath of office as the 25th Secretary of the Air Force at the Pentagon, Arlington, Va., Oct. 18, 2019. (U.S. Air Force photo by Wayne Clark) #YearInPhotos #AirForce #USAF #SecAF #SecAF25 #CSAF (Day 20/100)