http://www.infowars.com/what-have-we-gotten-for-the-trillion-dollars-we-have-spent-on-wars-in-afghanistan-iraq-and-libya/

But what we have been doing over the past decade has not worked. In fact, the Bush/Obama foreign policy has been an abject failure. We have poured hundreds ofbillions of dollars down the drain and we are lesssecure today than at any point since World War II.
It is time to admit that Barack Obama and George W. Bush have been fundamentally wrong about these wars. Because of their foolishness, we are less safe today and our allies are less safe today.

I have seen numbers around three Trillion.

Every gun that is made, every warship launched, every rocket fired signifies, in the final sense, a theft from those who hunger and are not fed, those who are cold and not clothed. This world in arms is not spending money alone. It is spending the sweat of its laborers, the genius of its scientists, the hopes of its children. This is not a way of life at all in any true sense. Under the cloud of threatening war, it is humanity hanging from a cross of iron.
Dwight D. Eisenhower, From a speech before the American Society of Newspaper Editors, April 16, 1953
34th president of US 1953-1961 (1890 - 1969)