April 1, 1918: Temporary Captain (RAF) / Temporary Major
May 1, 1919: Acting Major
August 1, 1919: Flight Lieutenant
July 1, 1925: Squadron Leader
July 1, 1933: Wing Commander
February 1, 1937: Acting Group Captain
July 1, 1938: Group Captain
July 1, 1940: Temporary Air Commodore
December 1, 1941: Temporary Air Vice Marshal
April 14, 1942: Air Commodore
June 1, 1943: Air Vice Marshal
February 15, 1944: Acting Air Marshal
January 1, 1946: Temporary Air Marshal
October 1, 1946: Air Marshal
March 1, 1949: Air Chief Marshal
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