I wouldn't worry about subs (or any other major defence program) with this Labor Government.
The only reason they are talking tough about having 12 subs and building them in SA is that this bunch of vandals don't have to fund them in the forward estimates. Hence the typical delaying tactic of another white paper and report into what sub we should have (no doubt given to fair work Australia to do so its take 5 times longer than it should). Thus making sure Labor can further cook the books. They have NO intent of putting billion aside for this, a pultry 235mil of taxpayers money will buy them the time they need.
I heard the Labor lack of defence minister today scoffing at the likelihood of any invasion of the mainland. As unlikely as it is it is the very thing this government should be preparing defence for, not as a source of funding for dole bludgers.
And to keep the aviation theme, so much for the Bou replacement program...again