MtG, the Joint Chiefs did not take a position of the use of the bomb because that was a decision beyond their competence, as George Marshall stated. However, all the top commanders did not think the bomb was necessary militarily. Most were appalled at it use on civilians.
Also, most of the commanders were convinced that the Japanese would have surrendered without an invasion regardless. Some thought they would surrender even without the declaration of war by the USSR. But most were convinced that whatever hope the Japanese had were finally dashed by that declaration. After it they clearly had no hope of retaining Chinese, Manchurian or Korean possessions. They already had no hope of defeating an American blockade. The only question was how much longer would the leadership continue to permit the people to suffer.
The bomb was not necessary from a military point of view. The consensus view at the time was that is was also not necessary from a political point of view.
Also, most of the commanders were convinced that the Japanese would have surrendered without an invasion regardless. Some thought they would surrender even without the declaration of war by the USSR. But most were convinced that whatever hope the Japanese had were finally dashed by that declaration. After it they clearly had no hope of retaining Chinese, Manchurian or Korean possessions. They already had no hope of defeating an American blockade. The only question was how much longer would the leadership continue to permit the people to suffer.
The bomb was not necessary from a military point of view. The consensus view at the time was that is was also not necessary from a political point of view.
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