26 July 1930: Pilot Officer
26 January 1932: Flying Officer
26 January 1936: Flight Lieutenant
1 October 1938: Squadron Leader
1 January 1946: Wing Commander (temp.) [1 December 1940]
1 October 1946: Wing Commander
11 February 1947: Group Captain (temp.) [1 January 1944]
1 July 1947: Group Captain
1 July 1953: Air Commodore
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