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.
750 Naval Air Squadron
The Royal Navy Observer School grew out of HM Naval Seaplane Training School at RNAS Lee-on-Solent as a result of a series of changes of identity and parent unit. From 1918 until 1939 the Royal Air Force was responsible for naval aviation, including training and provision of aircrew to the Royal Navy. With the return of naval aviation to the Royal Navy on 24 May 1939, the Observer School was established as 750 Naval Air Squadron of the Fleet Air Arm. During World War II the squadron moved to Trinidad to continue training aircrew. It was temporarily disbanded in October 1945. The squadron reformed in 1952 and is currently based at RNAS Culdrose, where it trains approximately 30 Royal Navy observers every year.