On the night of March 9, 1945, U.S. warplanes launch a new bombing offensive against Japan, dropping 2,000 tons of incendiary bombs on Tokyo over the course of the next 48 hours. Almost 16 square miles in and around the Japanese capital were incinerated, and between 80,000 and 130,000 Japanese civilians were killed in the worst single firestorm in recorded history. Early on March 9, Air Force crews met on the Mariana Islands of Tinian and Saipan for a military briefing. They were planning a low-level bombing attack on Tokyo that would begin that evening, but with a twist: Their...