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I thought it was the Germans?

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That was Pearl Harbor...

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Besides, although the bombs killed 100k-ish, SO many more Japanse and especially American lives would've been lost in the continuance of the war at the pace it was going. The Japanese would've feverishly defended everything until the last man was standing on the Japanese mainland, this is well known.

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In the spring of 1945, the Army Service Forces under Lt. Gen. Brehon B. Somervell was working under a figure of "approximately" 720,000 for the projected replacements needed for "dead and evacuated wounded" through December 31, 1946, which was for the whole invasion including Honshu. These figures are for Army and Army Air Force personnel only, and do not include replacements needed for the Navy and Marine Corps.[108]

A study done for Secretary of War Henry Stimson's staff by William Shockley estimated that conquering Japan would cost 1.7–4 million American casualties, including 400,000–800,000 fatalities, and five to ten million Japanese fatalities. The key assumption was large-scale participation by civilians in the defense of Japan.[17]

Outside the government, well-informed civilians were also making guesses. Kyle Palmer, war correspondent for the Los Angeles Times, said half a million to a million Americans would die by the end of the war.

Herbert Hoover, in memorandums submitted to Truman and Stimson, also estimated 500,000 to 1,000,000 fatalities, and those were believed to be conservative estimates; but it is not known if Hoover discussed these specific figures in his meetings with Truman. The Chief of the Army Operations Division thought them "entirely too high" under "our present plan of campaign."[109]

In evaluating these estimates, especially those based on projected Japanese troop strength (such as General MacArthur's), it is important to consider what was known about the state of Japanese defenses at the time, as well as the actual condition of those defenses (MacArthur's staff believed Japanese manpower on Kyushu to be roughly 300,000).[112] Nearly 500,000 Purple Heart medals (awarded for combat casualties) were manufactured in anticipation of the casualties resulting from the invasion of Japan; the number exceeded that of all American military casualties of the 65 years following the end of World War II, including the Korean and Vietnam Wars. In 2003, there were still 120,000 of these Purple Heart medals in stock.[113] There were so many left that combat units in Iraq and Afghanistan were able to keep Purple Hearts on hand for immediate award to soldiers wounded in the field.[113]

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