In September 1945 Joe O'Donnell was a twenty-three-year-old Marine Corps photographer wading ashore in Japan, then under American occupation. His orders were to document the aftermath of U.S. bombing raids in Japanese cities, including not only Hiroshima and Nagasaki, but also cities such as Sasebo, one of the more than sixty Japanese cities firebombed before the atomic blasts. The people I met, he now recalls, the suffering I witnessed, and the scenes...