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- For the 1996 film, see Mission: Impossible.
MI1 or British Military Intelligence, Section 1 was a department of the British Directorate of Military Intelligence, part of the War Office. It was set up during World War I. It contained "C&C", which was responsible for Code Breaking. In 1919 MI1 and the Royal Navy's Room 40 were closed down and merged into the Government Code and Cypher School (GC&CS).
Oliver Strachey was in MI1 during WWI. He transferred to GC&CS and served there during WWII. John Tiltman was seconded to MI1 shortly before it merged with Room 40.
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