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The Korean battle situation in August 1950 caused the Department of the Army to decide to increase its strength there by moving the 3rd Infantry Division from the United States.
Anticipating future offensive operations in Korea, General MacArthur on 19 August requested troops for two corps headquarters and asked that these two corps be designated I and IX Corps. [21-14]
Losses in the American divisions fighting in Korea had been so great in the first two months that special steps had to be taken to obtain replacements. On 19 August to help meet this demand, Eighth Army Rear in Japan ordered what it called "Operation Flush out." This required that all units in Japan reassign part of their troops as replacements for use in Korea.