However the US now finds itself in a position where there's no visible/tangible threat to it anymore. Cold war is long over, bin Laden is gone, Saddam is gone, Gaddafi hasn't yet reached the US Enemy No. 1 status. So there's a vaccuum as far as military actions abroad are concerned. How do you get the people to rally behind something so it can be achieved? What is there to achieve?
HoneyBee why do you think they need one ? maybe less Military action is exactly what America needs right now.

Has anyone else noticed that wars are bleeding expensive, and in the end it is the tax payer that foots the bill, eventually the tax payer finds that they dont want to fund that much military action any more and would rather the money was spent on something more tangible.

Also China who is rolling in Money, is doing it's very best to stay out of any conflicts that are not on it's own doorstep and i think that the sheer cost is one of the reasons.