The next jump from the marshall islands is to the marianas. No one's quite sure when and where the americans are going to attack thoumh because their time tables keep catching the japanese off guard. The challenges are no everyone knows about d day, but as a military historian, craigel simons writes in his book, spruced up for war by Raymond Meulenberger. Overlord was even larger than the sipan fleet he devoted to firebombingnormandy.