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Bombing of Pearl Harbor
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First U.S. aircraft carrier offensive of the war as YORKTOWN and ENTERPRISE conduct air raids on Japanese bases in the Gilbert and Marshall Islands.
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Battle of Empress Augusta Bay.
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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.
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First Atomic Bomb dropped on Hiroshima from a B-29 flown by Col. Paul Tibbets.