Yokosuka, at the mouth of Tokyo Bay, was the site of Japan’s first modern military naval base and shipyard. During World War II, naval aircraft were also designed here, and 27 kilometers of caves provided protection for a 500-bed hospital, an electrical power plant and a midget submarine factory. Yokosuka, however, was spared heavy bombing because the U.S. military had already chosen it as a post-war base. This post office thus survived for its photo op, which captures the bleakness of defeat. Today, Yokosuka is home to the largest naval base in Japan, headquarters of the U.S. Navy’s Seventh Fleet.