Encyclopedia : O : OP : OP2 (1 articles)

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OP-20-G
OP-20-G was a US Navy codebreaking section. It began with a secret slush fund of US$100,000 in 1918. Officers went to Tokyo to learn Japanese and in the 1920s, listening posts were established. OP-20-G, the Washington codebreaking office, was established in 1931, and began as the Research Desk esta..

 

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