Photographs of the codebook were given to the cryptanalysts at the Research Desk and the processed code was kept in red-colored folders (to indicate its Top Secret classification). In 1923, a US Navy officer acquired a stolen copy of the Secret Operating Code codebook used by the Japanese Navy during World War I. Although they worked on a series of codes and cyphers, their most important successes involved RED, BLUE, and PURPLE. Intelligence officers from the Army and Navy (and later civilian experts and technicians) were all under one roof. Magic was set up to combine the US government's cryptologic capabilities in one organization dubbed the Research Bureau. It involved the United States Army's Signals Intelligence Service (SIS) and the United States Navy's Communication Special Unit. Magic was an Allied cryptanalysis project during World War II. Allied cryptanalysis project during World War II
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