If and when we move, Ray Charles will be able to see us coming. There is no way that we can order, marshal, transport, deploy and sustain the men and equipment for a job this large without the whole world knowing well in advance. So you don't need to bother with tea leaves or hidden signs.
This obvious lack of secrecy is not such a bad thing, really. Since any enemy will know we're coming, we must have overwhelming force to overcome the lack of surprise. This keeps politicians and planners from going to war on the cheap...
keeps politicians and planners from going to war on the cheap...Plus, they don't want to get blamed, if things go wrong, for not providing enough money.