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Why, you ask ? ....ssst, don't tell anyone, but that would be the only condition that would've allowed us to have been even bothered to occupy Darwin !
With PoD no earlier than 1950 (the beginning of Indonesian Liberal Parliamentary Period, IOTL ended in 1959), make a scenario of antagonistic relations between Indonesia and Australia, in which in this matter Indonesia is being supported by the West. Based on this, physical conflict between the two countries ITTL should've happened at least once before 1990.