Research undertaken over a 15-year period by military historian David O'Keefe uncovered 100,000 pages of classified British military archival files that documented a "pinch" mission overseen by Ian Fleming (best known later as author of the James Bond novels), coinciding with the Dieppe Raid. O'Keefe states that No. 30 Commando was sent to Dieppe to steal one of the new German 4-rotor Enigma code machines, plus associated codebooks and rotor setting sheets. The Naval Intelligence Division (NID) planned the "pinch" to pass such items to cryptanalysts at Bletchley Park to assist with Ultra decryption operations. O'Keefe alleges the presence of other troops landing at Dieppe was to provide support and create a distraction for the commando units attempting to reach the German admiralty headquarters and capture the Enigma machine, that the premise of the Dieppe Raid was 'cover' for the Enigma target.