April 19, 2012

Military Intelligence — this week in history April 19, 2012

Sinkov, Abraham (SIS)
Col Abraham Sinkov, U.S. Signal Corps

Central Bureau created

April 15, 1942

USAICoE History Office

The Central Bureau was a joint American and Australian organization serving as the cryptologic element for the Southwest Pacific. The Australian unit was the Special Wireless Group, and the American unit was the Signals Intelligence Service.

The CB was set up and commanded by Col. Abraham Sinkov, who had trained and served under William Friedman in the SIS from 1930 to 1936. As described by Sinkov, “the cryptanalytic effort of CB worked closely with the Army Security Agency and produced useful communications intelligence, solved messages, gave information about enemy movements, plans and intentions, capabilities at various island locations, [and] precise sailing schedules of ships carrying troops and supplies.

“This Week in History” is a feature on the Command History Office website.

Those with AKO access, can go to their site at

To learn more about the 2012 MI Branch and Corps Commemoration, see the public website,


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