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The first clue to the meaning of "AF" came when a Japanese plane was heard reporting that it was near "AF". The only land mass that was anywhere near where we thought the plane was was Midway Island. In order to confirm this the garrison at Midway was ordered, by courier, to send a fake message reporting trouble with their water treatment facility. The next day a Japanese listening post reported to Tokyo that "AF" was having trouble with its water treatment facility. That proved it. Michael Montagne

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Q: When American intelligence intercepted the message 'AF' from the Japanese after Pearl Harbor how did they know it was about the fleet at Midway?
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Why was there no declaration of war before the attack pearl harbor?

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What were some coded messages intercepted and decoded by the US Military Intelligence and Great Britain?

One was the JN-25 code which gave us the battle of Midway Island. We were only decoding 10% of the code at the time, but on a hunch they sent a fake message to Midway. The message was to say that their fresh water condenser was broken. It was sent out on the less secure waves so the Japanese intercept station would get the whole message. Their response identified that Midway was coded "AF". On the British side, the HMS Bulldog was able to capture an enigma coding machine from a German U-Boat. It provided them info as to where some of the U-Boats were at and warships were sent to intercept. Then there was also the Navajo Code Talkers who were able to talk over the open waves during WWII (and maybe other wars) because the Navajo language was never printed until late in the 1950's. The only bad thing about being a NCT was that if there was a chance he would be captured, the officer or NCO assigned to him was under order to kill him to protect the code.


What did roosevelt receive on December 6 1941?

a 14 part message from the Japanese that was then deciphered but only the first 13 parts where decoded.

Related questions

How did Nimitz know about Japanese intentions at the Battle of Midway?

Nimitz obtained crucial intelligence from U.S. codebreakers who had cracked the Japanese naval codes, specifically the JN-25 code. This allowed him to learn about the Japanese plan to attack Midway Atoll and estimate the timing and location of their attack. This intelligence played a significant role in Nimitz's decision-making and ultimately contributed to the American victory at the Battle of Midway.


What is the reason why American audience thought Godzilla was another monster movie?

they misinterpreted the message from the Japanese producers


What was the message sent to Mexico that was intercepted by the british and caused the us to enter ww1?

the zimmerman note.


The Pearl Harbor American navy failed to decipher the Japanese code?

There was a message decoded and passed on to upper level Naval officers. The message went unnoticed or ignored. There was another message from an American Ship letting headquarters know they had to use missiles on miniature Japanese subs prior to the air attack. So someone at the headquarters knew but did not believe it. Once the attack started many people were confused it was a drill until they went outside to see it was the Japanese. So the Japanese caught the American Navy with their pants down.


What helped push the US into World War 1?

They intercepted a message from Germany to Mexico to try to get Mexico to join the war


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Rebellion. When has artificial intelligence arrived? When a computer says "no." and its not just a pat answer. ( i.e. not an error message )


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What caused roosevelt to move towards supporting the war?

For one, the message the US intercepted from Germans, meant for Mexico for Mexico to declare war against the US


What did zimmerman telegram say?

The Zimmermann Telegram was a German message to Mexico that urged it to invade the United States, with the guarantee that its former territories Arizona, New Mexico, and Texas would be returned. It was intercepted and released to the American public, galvanizing the public into full support for war with Germany.


The Zimmerman Telegram was a secret message from Germany intercepted by British intelligence?

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Was the Battle of Midway an Axis victory?

No, the conflict between carrier fleets from June 4 to June 7, 1942 was a decisive victory by the US fleet over the Japanese fleet. Coming 7 months after the Japanese attack at Pearl Harbor, the battle saw the sinking of 4 of the 6 Japanese carriers from the earlier battle, and is considered one of the pivotal battles of the Pacific Theater of World War II. The victory was made possible by the decoding efforts of the US Navy, which intercepted key messages sent by the Japanese Navy. This included transmitting a faked message from Midway in a cypher that the US knew the Japanese had broken. The message said that the desalination plant on Midway was having problems, and a Japanese message was read that mentioned the codename of the place they planned to attack, and that its desalination plant was having problems -- this made it certain that the target was Midway. This gave the US enough time to fortify the island and send most of their aircraft carriers there.


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