The Army Department Constabulary was a police force in the United Kingdom formed as a result of the Special Constables Act 1923. Originally, the Army used serving soldiers to guard its establishments and the only call for police was at places like the Royal Arsenal

Royal Arsenal

The Royal Arsenal, Woolwich, originally known as the Woolwich Warren, carried out armaments manufacture, ammunition proofing and explosives research for the British armed forces. It was sited on the south bank of the River Thames in Woolwich in south-east London, England.-Early history:The Warren...

 at Woolwich. A War Department Constabulary was formed in 1925, and was renamed Army Department Constabulary in 1964 when the War Office

War Office

The War Office was a department of the British Government, responsible for the administration of the British Army between the 17th century and 1964, when its functions were transferred to the Ministry of Defence...

 became the Army Department. The Ministry of Defence Police

Ministry of Defence Police

The Ministry of Defence Police is a civilian police force which is part of the United Kingdom's Ministry of Defence. The force is part of the larger government agency, the Ministry of Defence Police and Guarding Agency , together with the Ministry of Defence Guard Service...

 absorbed the ADC in 1971, along with the Air Force Department Constabulary

Air Force Department Constabulary

The Air Force Department Constabulary was a police force in the United Kingdom, responsible for policing the airfields and aerodromes under the control of the Air Ministry, later the Air Force Department....

 and the Admiralty Constabulary

Admiralty Constabulary

The Admiralty Constabulary was a police force in the United Kingdom formed as a result of the Special Constables Act 1923. The Constabulary can trace its history back to 1686 when the Royal Navy needed an organisation to prevent dockyard crime...

.