Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 30. Chapters: Royal Observer Corps, List of Royal Observer Corps / United Kingdom Warning and Monitoring Organisation Posts, List of Rainbow Codes, Operational instruments of the Royal Observer Corps, Royal Observer Corps Monitoring Post, List of ROC Group Headquarters and UKWMO Sector controls, Atomic Weapons Detection Recognition and Estimation of Yield, York Cold War Bunker, Ground Zero Indicator, Fixed Survey Meter, Blue Peacock, HANDEL, Bomb Power Indicator. Excerpt: The Royal Observer Corps (ROC) was a civil defence organisation operating in the United Kingdom between 29 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; latterly a serving RAF Air Commodore. In 1925, following a Defence Committee initiative undertaken the previous year, the formation of an RAF command concerning the Air Defence of Great Britain led to the provision of a Raid Reporting System, itself delegated to a sub-committee consisting of representatives from the Air Ministry, Home Office and the General Post Office. This Raid Reporting System was to provide for the visual detection, identification, tracking and reporting of aircraft over Great Britain, and was eventually to become known as the Observer Corps. The Observer Corps was subsequently awarded the title Royal by His Majesty King George VI in April 1941, in recognition of service carried out by Observer...