From the beginning of 1942, the Japanese code discussed a place called “AF. ”Joseph Rochefort felt the Japanese were planning an important battle aimed at “AF. ”After several weeks, he and other naval experts told Admiral Nimitz that their best idea was that the “AF” in the Japanese code was the American-held island of Midway. Admiral Nimitz said he must have more information to prepare for such an attack.

　　The Navy experts decided to trick Japan. They told the American military force on Midway to broadcast a false message. The message said the island was having problems with its water-processing equipment. The message asked that fresh water be sent to the island immediately. This message was not sent in code.

　　Several days later, a Japanese radio broadcast in the JN-25 code said that “AF” had little water. Joseph Rochefort had the evidence he needed. “AF” was now known to be the island of Midway. He also told Admiral Nimitz the Japanese would attack Midway on June 13. The battle that followed was a huge American victory. That victory was possible because Joseph Rochefort learned to read enough of the Japanese code to discover the meaning of the letters “AF”.

　　One American code has never been broken. Perhaps it never will. It was used in the Pacific during World WarⅡ. For many years the government would not discuss this secret code. Listen for a moment to this very unusual code. Then you may understand why the Japanese military forces were never able to understand any of it.

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