OP-20-G

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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 established by Commander Laurance Safford. Progress was limited by the Navy's regulation of keeping officers on land no more than two years and by such an extreme secrecy that even the Army didn't know of intercept stations a few miles from their own.

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