Special Investigation Branch Regiment

The Special Investigation Branch (SIB) is the name given to the detective branches of all three British military police arms: the Royal Navy Police, Royal Military Police and Royal Air Force Police. It is most closely associated with the Royal Military Police, which has the largest SIB. SIB members usually operate in plain clothes, although they may wear uniform when serving overseas. Members are usually senior non-commissioned officers (sergeants or petty officers or above) or commissioned officers, although the Royal Air Force SIB also employs corporals.

Royal Military Police SIB
Although an SIB appears to have existed in the British Army of the Rhine in Germany between 1919 and 1926, the origins of the army's SIB are really in 1940, when twenty Scotland Yard detectives were enlisted in the Corps of Military Police to deal with the pilfering of military stores within the British Expeditionary Force (BEF) in France. The unit was formed on the recommendations of Detective Chief Inspector George Hatherill (who later went on to investigate the serial killers John Reginald Christie and John George Haigh, and the Great Train Robbery) and command was given to Detective Superintendent Clarence Campion, head of Scotland Yard's Criminal Record Office, who was commissioned as a Major. Campion was hit in the head by shrapnel during the Dunkirk evacuation and died on 20 May 1940, the only SIB casualty of the BEF. After this beginning, the SIB was established on a full-time basis.

The RMP SIB now consists of about two hundred personnel, including Scenes of Crime Officers and forensic technicians. It is divided into numbered units called Sections (for instance, 33 Section SIB RMP), which are subdivided into Detachments, each usually commanded by a Warrant Officer Class 2. There is a section or detachment on most major British Army stations. There is also a Territorial Army section, made up entirely of people who are CID officers in civilian police forces during their everyday lives. The Headquarters SIB RMP is at Campion Lines in Bulford, Wiltshire. Within the RMP, SIB is known as "the Branch" or more commonly "the Feds"

The SIB was recently subject to an inspection by Her Majesty's Inspectorate of Constabulary (HMIC). The Armed Forces Bill 2006 seeks to require the SIB to refer investigations into inherently serious crimes directly to the Service Prosecuting Authority (SPA) rather than to commanding officers.

Royal Air Force Police SIB
The SIB of the Royal Air Force had the distinction of being the only branch-specific investigative unit entrusted with a major war crime when five officers and fourteen NCOs were given the assignment of investigating the Stalag Luft III murders immediately following the Second World War.