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The name of the code was JN-25. The code was named by the Americans. The "JN" simply designated "Japan". The "25" designated the 25th version of a code. The JN-25 code was the code in use prior to the Battle of the Coral Sea in early 1942 as well as through and including the Battle of Midway in June of 1942. Japan changed their codes to JN-26 in August of 1942 (following their post-mortum after the Battle of Midway), which the code breakers at station HYPO (in Hawaii at Pearl Harbor) began to decode immediately, but took over eight weeks before they were at a 10% sucess rate (1 out of every 10 words). Code breakers did not conentrate strictly on Japan. They also worked on the codes of the Soviet Union, Gernamy, England and Italy as well. You notice that they worked on breaking the codes of foes as well as friends in an effort to gain as much knowledge as possible.

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Q: What was the Japanese code the US intercepted during Midway?
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