Operational instruments of the Royal Observer Corps
The Royal Observer Corps (ROC) was a civil defence organisation operating in the United Kingdom between October 1925 and 31 December 1995, when the Corps' civilian volunteers were stood down. (ROC headquarters staff at RAF Bentley Priory stood down on 31 March 1996). Composed mainly of civilian spare-time volunteers, ROC personnel wore a Royal Air Force (RAF) style uniform and latterly came under the administrative control of RAF Strike Command and the operational control of the Home Office. Civilian volunteers were trained and administered by a small cadre of professional full-time officers under the command of the Commandant Royal Observer Corps; a serving RAF Air Commodore.
Royal Observer Corps
The headquarters of each ROC "Group" operated from a control "Centre", responsible for and controlled between 30 and 40 observation "Posts", each of which would be some 10 km to 20 km from its neighbour. By 1945 there were 40 centres covering Great Britain, controlling in total more than 1,500 posts. (The ROC did not operate in Northern Ireland until 1954).