December 16, 1925: Pilot Officer
July 12, 1927: Flying Officer
March 11, 1931: Flight Lieutenant
April 1, 1937: Squadron Leader
June 1, 1940: Wing Commander (temp.)
June 1, 1942: Group Captain (acting)
November 20, 1942: Wing Commander [October 1, 1942]
October 15, 1944: Air Commodore (acting)
April 15, 1945: Group Captain (WS)
October 1, 1946: Group Captain
January 1, 1952: Air Commodore
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