 He flew more than 350 combat hours on 142 missions over Vietnam.In August 1968, Davis joined the Organization of the Joint Chiefs of Staff in Washington, D.C., where he served in the Directorate of Operations as an operations officer and later as chief of the Current Operations Branch, Strategic Operations Division.In August 1970 he was assigned as the Air Force member of the Chairman's Staff Group, Office of the Chairman of the Joint Chiefs of Staff.