as this, only two options could be considered by the United States government. One being the use of atomic weapons and the other being the invasion of mainland Japan.
             According to Truman's top military advisors, an invasion of mainland Japan would cost and an estimated 500,000 American lives, not to mention over a million Japanese deaths. Truman wrote years later, "We estimated that if we should be forced to carry this [invasion] plan to its conclusion, the major fighting would not end until the latter part of 1946, at the earliest. I was informed that such operations might be expected to cost over a million casualties, in American forces alone." Such an operation would also require the use of European theater American troops departure from Europe to Japan, to an aid in the assault. With the largest invasion force ever assembled, comprising of approximately 2,000,000 troops. (Far larger than the Normandy invasion) According to Major General Masakazu Amanu, the chief of the Operations Section at J
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