MacArthur who with Nimitz commanded the Pacific theatre of WWII. MacArthur had no stomach for a land invasion of Japan having clawed his way through most of the Pacific. And we know what the estimates were of that. And MacArthur expected Russia's help if there was to be land based invasion. This book is a good read, https://www.amazon.com/American-Caesar-Douglas-MacArthur-1880/dp/0316024740/ref=pd_lpo_sbs_14_img_0/136-5550429-0706124?_encoding=UTF8&psc=1&refRID=RG8AE38FVZM11KVRHRWP As an aside MacArthur later warned about ever fighting a ground war in SE Asia again. No one listened.