Established in late 1943 as a B-24 Liberator heavy bomb squadron under II Bomber Command at Wendover Field, Utah; later moving to Mountain Home Army Air Field, Idaho to complete its final phase of training. At Mountain Home, the squadron received new very long range B-24J aircraft in early May. Moved to Okinawa in June 1945. Engaged primarily in attacks against enemy airfields on Kyūshū until V-J Day. Also participated in incendiary raids, dropped propaganda leaflets over urban areas of Kyūshū and struck airfields in China, in southern Korea, and around the Inland Sea of Japan.