X-Day
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- For other uses of the term, please see X-Day (disambiguation).
X-Day is a military term that is shorthand for "attack day." It was the term used by the Japanese Imperial General Headquarters for the day that they would begin the Greater East Asia War, a part of World War II. The term has also been applied to the invasion of Kyushu, which was scheduled for November 1, 1945, part of Operation Downfall, a planned Allied invasion of Japan during World War II which became unnecessary due to Japan's surrender