August 16, 1922: Pilot Officer
February 16, 1924: Flying Officer
July 1, 1928: Flight Lieutenant
June 1, 1936: Squadron Leader
April 1, 1939: Wing Commander
September 1, 1941: Group Captain (temp.)
February 3, 1944: Acting Air Commodore
August 3, 1944: Group Captain (WS)
January 1, 1946: Group Captain / Air Commodore (temp.)
July 1, 1947: Air Commodore
July 1, 1949: Air Vice Marshal
January 1, 1956: Air Marshal
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