 In January 1957 the Air Commodore rank was made substantive and he was appointed as Air Officer Administration at Headquarters British Forces Arabian Peninsula.On 29 June 1959 Warfield took over as Commandant Royal Observer Corps from Air Commodore J H T Simpson.The ROC was Warfield's final service appointment and he retired on 26 June 1961, handing over command to Air Commodore C M Wight-Boycott.