I understand the general feeling that Indonesia is somehow a threat to Australia but it really is paranoid nonsense. Indonesia has never threatened Australia and with the best will in the world the Indonesian armed forces could barely organise a five-a-side football match if you booked the court a month in advance, provided a ball and even give them ten men to make up each team.India must admit not heard that one before. But Indonesia since it was formed and up until recently would swallow up every island nation it could. The Aussies were worried for a good reason. The reason they got Subs, certainly weren't for defence.
The idea of the threat that Indonesia somehow poses to Australia comes from military interventions that happened decades ago and which had nothing to do with Australia. To give Indonesia its due, it has been involved in a lot fewer wars in the past half century than Australia has. The myth of the sabre-rattling Indonesian menace, massing to the north of Australia, ready to pounce at a moment's notice is nothing more than that, a myth.
Trust me, Indonesia is not now, nor ever in the future, about to invade Australia.