When it comes to protecting Australian shores other countries have always provided the battlefields. New Zealand,Sudan,South Africa,Turkey, Middle East Belgium,France, Russia, North Africa, Greece,Crete,Malaysia,Singapore,Burma,Indonesia (Dutch East Indies),Papua New Guinea, Pacific Islands,Korea,Borneo,Vietnam,East Timor,Iraq,Afghanistan. They are just the land battles and there will be countries I have missed. I think Australian defense analysts and planners have a firm idea of what part the Indonesian archipelago will play in any future conflict.