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.
Observer Group
On January 13, 1941, Major General Holland M. Smith relinquished command of 1st Marine Division and became Commanding General of I Corps (Provisional), U.S. Atlantic Fleet with Colonel Graves B. Erskine as his Chief of Staff. Throughout the year, the joint command, which was assembled together at Quantico, Virginia, was subsequently redesignated variously several times: Task Force 18, U.S. Atlantic Fleet; 1st Joint Training Force, U.S. Atlantic Fleet; Atlantic Amphibious Force; Amphibious Force, Atlantic Fleet; and finally Amphibious Corps, Atlantic Fleet. Colonel Erskine, under General Smith, was in charge of the Intelligence section jointly devised the plan in organizing a unit of men that were specialized in reconnoitering enemy shores for the upcoming mission of invading Europe and North Africa during World War II.