Not as nearly as if we had to invade Japan. The first wave would 770,000 Allied troops with an expected 35% loss (270,000 casualties) in the first 30 days to take the Japanese Island of Kyushu. The expected casualties after 120 days would be around 395,000. The second wave "an invasion of Honshuand and the capture of Tokyo, projected for March 1946 - would require a force of 1 Million. And would exact hundreds of thousands of casualties" (taken from James Bradley’s Flags of Our Fathers) not to mention the casualties the Japanese would face.