Pearl Harbor, Iran and North Korea

On Dec. 7, 1941 the United States suffered the worst intelligence failure in its history - before or since - when Japanese planes destroyed much of the U.S. Pacific Fleet at Pearl Harbor. Full Story
DENG

Nanjing, China

#1 Dec 7, 2011
THE JAPAN NAVAL CODES WERE UNDERSTOOD IN JANUARY,1940, BY THE UNITED STATES INTELLIGENCE GIVING THE UNITED STATES GOVERNMENT FULL KNOWLEDGE OF ALL EVENTS UP TO AND AFTER THE PEARL HARBOR BOMBING.
Jeff Dege

Minneapolis, MN

#2 Dec 11, 2011
That's simply not true.

The USN had broken some of the codes, and had partial information. We knew the Japanese were intended an extensive surprise attack, but we believed it would be aimed at Singapore and maybe Manila.

We didn't know where the Japanese fleet carriers were, but a signal from a destroyer that had long been a part of one of the carriers was intercepted in the South China Sea.

Everything we had indicated that the Japanese would be attacking in that area, nothing indicated an attack on Pearl. And, of course, the Japanese did attack Malaysia and the Philippines - on a much larger scale than they did on Pearl.

If you're really looking for intelligence failures, ask yourself how MacArthur's planes could have been caught on the ground, 12 hours after the attack at Pearl?

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