By the summer of 1945, the defeat of japan was a foregone conclusion. the japanese navy and air force were destroyed. the allied naval blockade of japan and intensive bombing of japanese cities had left the country and its economy devastated. at the end of june, the americans captured okinawa, a japanese island from which the allies could launch an invasion of the main japanese home islands. u. s. general douglas macarthur was put in charge of the invasion, which was code-named "operation olympic" and set for