No, they wouldn't. Unless these soldiers can walk on water and march hundreds of miles out to sea, they posed little threat to US forces unless they were to approach the Japanese shores in order to land troops. No invasion = no casualties. Then if I suggested you read some books, would you really have the inclination to confirm my sources for yourself? Sea of Thunder ~ Evan Thomas The Two Ocean War ~Robert K Mackie Derailing the Tokyo Express Battleship Musashi Battle of Leyte Gulf I don't have all the authors on the top of my head, but I'll get them when it's convenient. No such plan was seriously drawn up that I know of. The reason isn't because it would have been unsound, but because US citizens wouldn't have been satisfied with anything less than Japan's unconditional surrender. It was politics which an invasion or the A-bomb would have been used. The logical tactical move with minimal loss of life would have been a blockade.