Special Investigation Branch
Overview
The Special Investigation Branch (SIB) is the name given to the detective
Detective
A detective is an investigator, either a member of a police agency or a private person. The latter may be known as private investigators or "private eyes"...

 branches of all three British
United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 military police
Military police
Military police are police organisations connected with, or part of, the military of a state. The word can have different meanings in different countries, and may refer to:...

 arms: the Royal Navy Police, Royal Military Police
Royal Military Police
The Royal Military Police is the corps of the British Army responsible for the policing of service personnel, and for providing a military police presence both in the UK, and whilst service personnel are deployed overseas on operations and exercises.Members of the RMP are generally known as...

 and Royal Air Force Police
Royal Air Force Police
The Royal Air Force Police is the Service Police branch of the Royal Air Force. It was formed on 1 April 1918, when the RAF was formed by the merger of the Royal Flying Corps and the Royal Naval Air Service . It is responsible for the policing of all service personnel much like there RN or Army...

. 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 officer
Non-commissioned officer
A non-commissioned officer , called a sub-officer in some countries, is a military officer who has not been given a commission...

s (sergeant
Sergeant
Sergeant is a rank used in some form by most militaries, police forces, and other uniformed organizations around the world. Its origins are the Latin serviens, "one who serves", through the French term Sergent....

s or petty officer
Petty Officer
A petty officer is a non-commissioned officer in many navies and is given the NATO rank denotion OR-6. They are equal in rank to sergeant, British Army and Royal Air Force. A Petty Officer is superior in rank to Leading Rate and subordinate to Chief Petty Officer, in the case of the British Armed...

s or above) or commissioned officers, although the Royal Air Force SIB also employs corporal
Corporal
Corporal is a rank in use in some form by most militaries and by some police forces or other uniformed organizations. It is usually equivalent to NATO Rank Code OR-4....

s.
Although an SIB appears to have existed in the British Army of the Rhine
British Army of the Rhine
There have been two formations named British Army of the Rhine . Both were originally occupation forces in Germany, one after the First World War, and the other after the Second World War.-1919–1929:...

 in Germany
Germany
Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

 between 1919 and 1926, the origins of the army's SIB are really in 1940, when twenty Scotland Yard
Scotland Yard
Scotland Yard is a metonym for the headquarters of the Metropolitan Police Service of London, UK. It derives from the location of the original Metropolitan Police headquarters at 4 Whitehall Place, which had a rear entrance on a street called Great Scotland Yard. The Scotland Yard entrance became...

 detectives were enlisted in the Corps of Military Police to deal with the pilfering of military stores within the British Expeditionary Force
British Expeditionary Force (World War II)
The British Expeditionary Force was the British force in Europe from 1939–1940 during the Second World War. Commanded by General Lord Gort, the BEF constituted one-tenth of the defending Allied force....

 (BEF) in France
France
The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

.
 
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