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Back in 1916, when the original Secret Service Bureau became part of the Directorate of Military Intelligence, the existing departments were identified by the initials 'M.I' (for Military Intelligence). MI1 handled Codebreaking, MI2 covered intelligence to do with Russia and Scandinavia, while the rest of Eastern Europe came under the remit of MI3. MI4 looked after 'Aerial Reconnaisance', and so on. The other MI departments were either dismantled or else their work was absorbed into that of MI5 and MI6, and later the Government Communications Headquarters - GCHQ.
