July 28, 1928: Pilot Officer
January 28, 1930: Flying Officer
August 1, 1934: Flight Lieutenant
February 1, 1938: Squadron Leader
August 14, 1942: Acting Group Captain
February 14, 1943: Wing Commander (WS)
July 1, 1943: Group Captain (temp.)
June 1, 1944: Wing Commander
July 1, 1947: Group Captain
January 1, 1951: Air Commodore
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