Directorate of Military Intelligence - Sections

Sections

During the First World War, British secret services were divided into numbered sections named Military Intelligence, department number x, abbreviated to MIx, such as MI1 for information management.

The Branch, Department, Section, and Sub-section numbers varied through the life of the department, however examples include:
Name Details
MI1 Codes and cyphers. Later merged with other code-breaking agencies and became Government Code and Cypher School (now known as Government Communications Headquarters).
MI2 Information on Middle and Far East, Scandinavia, USA, USSR, Central and South America.
MI3 Information on Eastern Europe and the Baltic Provinces (plus USSR, Eastern Europe and Scandinavia after Summer 1941).
MI4 Geographical section—maps (transferred to Military Operations in April 1940).
MI5 Liaison with Security Service, following the transfer of Security Service to the Home Office in the 1920s.
MI6 Liaison with Secret Intelligence Service and Foreign Office.
MI7 Press and propaganda (transferred to Ministry of Information in May 1940).
MI8 Signals interception and communications security.
MI9 Escaped British PoW debriefing, escape and evasion (also: enemy PoW interrogation until 1941).
MI10 Technical Intelligence worldwide.
MI11 Military Security.
MI12 Liaison with censorship organisations in Ministry of Information, military censorship.
MI13 Not used (except in fiction).
MI14 Germany and German-occupied territories (aerial photography until Spring 1943).
MI15 Aerial photography. In the Spring of 1943, aerial photography moved to the Air Ministry and MI15 became air defence intelligence.
MI16 Scientific Intelligence (formed 1945).
MI17 Secretariat for Director of Military Intelligence from April 1943.
MI18 Used only in fiction.
MI19 Enemy PoW interrogation (formed from MI9 in December 1941).
MI (JIS) Axis planning staff.
MI L(R) Russian Liaison.

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