An Officer Cadet Training Unit (OCTU) took either civilians or other ranks and trained them to be officers. The majority of infantry officers would have been trained through the Royal Military College, Sandhurst, which became the Royal Military Academy in 1947. However, during wartime, Sandhurst did not have the capacity to train all of the officers required. Therefore, specialist OCTUs were established and supplied officers to distinct arms of service, including machine gun battalions as a separate specialism to the infantry.

Prior to being commissioned into a regiment, cadets may have worn the insignia of the General Service Corps.

Second World War

An OCTU at the outbreak of the Second World War was established with a headquarters element, a headquarters company, one recruit company and four training companies, each with three platoons. The output of the OCTU was 95 trained cadets per month. They received 100 each month (and expected a loss of 5). The cadets would spend four weeks in the recruit company and then 16 weeks in one of the training companies.

A complete transcript of the War Establishment for January 1940 is available to download:


In 1941, the Officer Cadet Training Unit for machine guns also trained officers for the Reconnaissance Corps. This may have been an additional OCTU, or possibly that based upon the Royal Northumberland Fusiliers, as this unit provided battalions for machine guns and reconnaissance.

162 OCTU

As of October, 1942, the 162 Officer Cadet Training Unit was in existence at Lanark, Scotland, to train officers for the Machine Gun Battalions.  By November, it is recorded as part of the York OCTU (previously No. 103) training both Motor Battalions and Machine Gun Battalions.

165 OCTU

This OCTU is recorded in 1942 as providing ‘general service training’ for officers, including a proportion to be sent to Infantry Machine Gun Battalions.  It was located at Dunbar.

170 OCTU

As of June, 1940, the 170 Officer Cadet Training Unit was in existence at Aldershot, Hampshire, to train officers for the Machine Gun Battalions.


  • The National Archives, WO 24/937, War Establishments 1940 January to June.
  • The National Archives, WO 365/150
  • The National Archives, WO 365/163.