In the months after the war, Australian authorities were responsible for administering all of Borneo and the NEI east of Lombok until the British and Dutch colonial governments were re-established. While British and Indian forces in the west of the NEI became caught up in the Indonesian National Revolution, the Australians were able to avoid clashes with local nationalists. Australian forces were also responsible for guarding the 344,000 remaining Japanese in the NEI and Australian territories and administering war crimes trials in these areas. A volunteer force was formed as Australia's contribution to the British Commonwealth Occupation Force (BCOF) in Japan, and Australia provided the BCOF's headquarters and a high proportion of its personnel. This force later formed the nucleus of the post-war Australian Army, which included permanent combat units for the first time.