Colonel Clay served in the 7th Battalion Royal Warwickshire Regiment during the Interbellum.
?: Cadet Serjt., Berkhamsted Sch. Contgt., Jun. Div., O.T.C
1 May 1929: Second-Lieutenant
11 August 1934: Captain
1 June 1939: Major
9 October 1957: Retires, retains the Hon. rank of Lieutenant Colonel
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