Central Bureau, Southwest Pacific Area: Difference between revisions
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A joint U.S.-Australian unit, the '''Central Bureau''' of the '''[[Southwest Pacific Area]] (SWPA)''' was a | A joint U.S.-Australian unit, the '''Central Bureau''' of the '''[[Southwest Pacific Area]] (SWPA)''' was a communications intelligence (COMINT) organization,, which supported [[Douglas MacArthur]]. It focused on Japanese ground and air communications, complementing the naval [[Fleet Radio Unit Melbourne]] (FRUMEL). Both worked at the theater level, and national level COMINT still flowed, selectively, to the theater (e.g., Japanese diplomatic traffic). | ||
Central Bureau was commanded by Major General S. B. Akin, who had been MacArthur's Chief Signal Officer, and formerly with the Army's [[Signals Intelligence Service]]. <ref name=MI>{{citation | Central Bureau was commanded by Major General S. B. Akin, who had been MacArthur's Chief Signal Officer, and formerly with the Army's [[Signals Intelligence Service]]. <ref name=MI>{{citation |
Latest revision as of 08:33, 26 August 2024
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![]() A joint U.S.-Australian unit, the Central Bureau of the Southwest Pacific Area (SWPA) was a communications intelligence (COMINT) organization,, which supported Douglas MacArthur. It focused on Japanese ground and air communications, complementing the naval Fleet Radio Unit Melbourne (FRUMEL). Both worked at the theater level, and national level COMINT still flowed, selectively, to the theater (e.g., Japanese diplomatic traffic). Central Bureau was commanded by Major General S. B. Akin, who had been MacArthur's Chief Signal Officer, and formerly with the Army's Signals Intelligence Service. [1] It did not appear to be under the direct control of MacArthur's intelligence officer, Charles Willoughby. MacArthur had had problems, prior to moving to Australia, with intelligence cooperation with the Navy, [2] but Willoughby's difficult personality may have contributed to the problem. That the Allied Intelligence Bureau did report to Willoughby suggests this arrangement was no accident. In the Pacific Theater, the COMINT unit under Joseph Rochefort worked very closely with the intelligence directorate under Edwin Layton. Other Allied intelligence units included:[1]
Central BureauAfter consultations between Australian and US signal and communications senior staff, MacArthur ordered Central Bureau to be created, partially to avoid his being dependent on Navy SIGINT. Central Bureau was made up of:
At first, Central Bureau was made up of 50% American, 25% Australian Army and 25% Royal Australian Air Force (RAAF) personnel, but additional Australian staff joined. In addition, RAAF operators, trained in Townville in intercepting Japanese telegraphic katakana were integrated into the new Central Bureau. CryptanalysisAssistant director for this function was Abraham Sinkov, one of the first cryptanalysts trained by William Friedman. Central Bureau broke into two significant Japanese Army cryptosystems in mid-1943. The US Army had shared, with the Navy, the Purple attack on Japanese diplomatic cryptosystems. Many histories assume Purple included Japanese military cryptanalysis, but those were separate projects, although generally under the same organizations. Non-cryptanalytic COMINTAfter creation of the Army Signal Security Agency, the cryptographic school at Vint Hill Farms, Warrenton, VA, trained analysts. As a real-world training exercise, the new analysts first solved the message center identifier system for the Japanese Army. Until Japanese Army cryptosystems were broken later in 1943, the order of battle and movement information on the Japanese came purely from direction finding and traffic analysis. Traffic analysts began tracking Japanese units in near real time. A critical result was the identification of the movement, by sea, of two Japanese infantry divisions from Shanghai to New Guinea. Their convoy was intercepted by US submarines, causing almost complete destruction of these units. [4] References
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