Royal Observer Corps
In 1929 the control of the Observer Corps passed from the county police forces to the Air Ministry, although Chief Constables retained responsibility for personnel and recruitment matters. 1 March 1929 saw the establishment of the new "Headquarters of the Observer Corps" at Hillingdon House, RAF Uxbridge in the west of London, and Air Commodore Edward A D Masterman CB CMG CBE AFC RAF (Rtd) was appointed as the first commandant of the Observer Corps. "Air Cdre" Masterman held this appointment until his retirement on 1 March 1936, and was succeeded by Air Commodore Alfred Warrington-Morris CG CMG OBE AFC RAF (Rtd), who would lead the Observer Corps through the critical period during the Second World War which saw the RAF emerge bruised but victorious following the Battle of Britain of 1940.
Aircraft recognition
To answer this new threat, Major General Edward Bailey Ashmore, a First World War pilot who had later been in command of an artillery division in Belgium, was appointed to devise improved systems of detection, communication and control. The Metropolitan Observation Service was created, covering the London area, known as the London Air Defence Area, and was soon extended to the coasts of Kent and Essex. This led to the establishment of the Observer Corps in 1925.