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U.S. code breakers pinpoint the location of Japanese Admiral Yamamoto flying in a Japanese bomber near Bougainville in the Solomon Islands. Eighteen P-38 fighters then locate and shoot down Yamamoto.
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U.S. begins submarine warfare against Japanese shipping
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Emperor Hirohito states his country's situation is now "truly grave."
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U.S. Air raids against Okinawa.
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October 25, 1944 - The first suicide air (Kamikaze) attacks occur against U.S. warships in Leyte Gulf. By the end of the war, Japan will have sent an estimated 2,257 aircraft. "The only weapon I feared in the war," Adm. Halsey will say later.
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The U.S. Army Air Force begins preparations for dropping the Atomic Bomb by establishing the 509th Composite Group to operate the B-29s that will deliver the bomb.