Signal Intelligence in the Pacific War

References

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• The National Archives (NA) prepare, at irregular intervals, lists of declassified material. The documents are part of Record Group (RG) 457 and comprise a variety of signatures, e.g. S RA, SRDG, SRDJ, SRGL, SRGNL, SRH, SRN, SRNA, SRNM, SRNS
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• 1993 . Ultra in the Pacific: How Breaking Japanese Codes and Ciphers Affected Naval Operations against Japan London : Leo Cooper . A wealth of documents covering these intelligence activities are held in the National Archives, Wasgington, D.C., e.g.: SRH 011: The Role of C.I. in Submarine Warfare in the Pacific; SRH 012: The Role of R.I. in the American-Japanese Naval War; SRH 019: Blockade Running between Europe and the Far East by Submarines 1942–1944; SRH 180: U.S. Naval Pre-World War II Radio Intercept Activities in the Philippine Islands; SRH 223: Various Reports on Japanese Grand Fleet Maneuvers, June-August 1933; SRH 224: Various Reports on Japanese Grand Fleet Maneuvers, August-October 1934; SRH 225: Various Reports on Japanese Grand Fleet Maneuvers; SRH 318: U.S. Naval Reports on Japanese Grand Fleet Maneuvers, 1936; SRH 319: Various Reports on Japanese Grand Fleet Maneuvers, 1937; SRH 320: Various Reports on Japanese Grand Fleet Maneuvers, 1927 to 1929; SRNS 001–1289: Japanese Naval Intelligence Summaries, 1942–1946; SRNS 1290–1458 Summaries of Japanese Warship/Fleet/Aircraft Locations and Intentions, 1942–1945; all RG 457, NA. See also John Winton, in particular 232–37; Edward J. Drea, MacArthur's Ultra: Codebreaking and the War against Japan, 1942–1945 (Lawrence, KS: University Press of Kansas, 1992), in particular 242, 237–40; idem, “Ultra and the American War against Japan: A Note on Sources,” Intelligence and National Security 3 (1988: 195204; Carl Boyd, “Anglo-American-Japanese Cryptologic Preparations for the Second World War,” The Enigma Bulletin (Kraków) 2 (May 1997): 17–52; idem, “U.S. Navy Radio Intelligence during the Second World War and the Sinking of the Japanese Submarine I-52,” The Journal of Military History 63 (1999): 33954
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• 1999 . Eagle Ibid., 159–75; Spector, 458–59; Frank Cain, “Signals Intelligence in Australia during the Pacific War,” Intelligence and National Security 14 (: 4061
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• Kahn , David . 1967 . The Codebreakers: The Story of Secret Writing London : Macmillan . 590; Holmes, Double-Edged Secrets, 124–25; Winton, Ultra in the Pacific, 102–103. Winton is correct in arguing that the figure of 200,000 code books mentioned by Japanese officers after the war is much too high since there would not have been enough room for these aboard the submarines
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• Ibid chapter 5
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