Royal Observer Corps
The Royal Observer Corps (ROC) was a civil defence organisation intended for the visual detection, identification, tracking and reporting of aircraft over Great Britain. It operated 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.
Royal Australian Survey Corps
On 3 July 1915, Military Order 396 of 1915 promulgated that His Excellency the Governor-General has been pleased to approve of: 'A Corps to be called the Australian Survey Corps being raised as a unit of the Permanent Military Forces. All officers, warrant officers, non-commissioned officers and men now serving in the Survey Section of the Royal Australian Engineers being transferred to the Australian Survey Corps with their present ranks and seniority.' The effective date of the foundation of the Corps was 1 July 1915 – on that day there were two officers and seventeen warrant officers and NCOs of the Corps (at that stage there were no sappers in the Corps). The Australian Survey Corps was placed fourth in the Order of Precedence of Corps after the Royal Australian Engineers.