The "What the Hell!" is a natural reaction. The answer to what it's costing us is quite another matter. But there's a guy who's done all that homework in this lengthy article.
The bottom line is approximately $170 billion. Can you imagine all the good we could do here at home with this money we're spending to cover the globe with our war-makers?
That tramp, tramp, tramp you hear is the sound of your money marching away to the great beyond.