At the beginning of WWII, LeMay was a major in the Air Force and commanded a bomber group in Europe. When he became involved with Japanese bombers, he quickly realized that his bomber group wouldn't be able to use the same techniques with the Japanese as were used with Germany. Japan was cloudier and had a severe jet stream that would often blow bombs dropped form a high altitude off target. LeMay suggested low-altitude flights, but missions were unsuccessful due to anti-aircraft. LeMay switched from B-17 Flying Fortresses to B-29 Superfortresses and had more success. These bombing raids were later known as the firebombing of Tokyo with the most destructive raid Operation Meetinghouse on 9-10 March 1945.