By mid-1945, the RAAF's main operational formation in the Pacific, the First Tactical Air Force (1st TAF), consisted of over 21,000 personnel, while the RAAF as a whole consisted of about 50 squadrons and 6,000 aircraft, of which over 3,000 were operational. The 1st TAF's final campaigns were fought in support of Australian ground forces in Borneo, but had the war continued some of its personnel and equipment would likely have been allocated to the invasion of the Japanese mainland, along with some of the RAAF bomber squadrons in Europe, which were to be grouped together with British and Canadian squadrons as part of the proposed Tiger Force. However, the war was brought to a sudden end by the US nuclear attacks on Japan. The RAAF's casualties in the Pacific were around 2,000 killed, wounded or captured.