In the immediate postwar years, Birchall served on the Canadian attaché staff in Washington, D.C., then was a member of the Canadian NATO delegation in Paris. He later commanded a fighter base and was commandant of the Royal Military College of Canada from 1963 until his retirement from the Canadian Forces in 1967. He retired from the RCAF rather than be associated with the unification of the Armed Forces. He later served as honorary colonel of 400 Tactical Helicopter and Training Squadron and No. 413 Squadron in the Air Reserve.