So what you are saying that if someone deployed an Army with 2-3 Hundred Tousand Troops, a couple of thousand Armoured Vehicles just across the Malaysian Border, Singapore would not notice. The 1st thing they would do is make that Causeway unpassable. Singapore is the largest most important Port in Asia if not the World. Every country in Asia understands this and if Singapore decided to invade Malaysia to take out that Army a number of Countries would not only support that decision but may even join in. 100 US Personnel is not a deterent they are backed up by 1.5 million personnel and that is a deterent, only maniacs p*** of the Americans ask Saddam Hussain and Osama Bin Ladin. There is a huge difference between 1942 and today, the Militaries in SE Asia are fully independent, unlikely to be fighting a war in Europe and the Japanese had complete Air and Sea superiority in 1942. Singapore was doomed in 1942 but today it has one of the most powerful Militaries in SE Asia and a number of Allies that would step up to defend it. Using Australia as an example, 90% of our trade comes through the Port of Singapore cut that lifeline and you stuff Australia big time. Australia and Singapore have a close relationship and so does the US, we are very happy with the current Political set up in Singapore and we will oppose any change to a more hostile Regime, it is simply too Strategically important to Australia for us not to oppose any changes.