Here's a shock

From The Washington Post, Projected Iraq War Costs Soar:

Even if a gradual troop withdrawal begins this year, war costs in Iraq and Afghanistan are likely to rise by an additional $371 billion during the phaseout, the report said, citing a Congressional Budget Office study. When factoring in costs of the war in Afghanistan, the $811 billion total for both wars would have far exceeded the inflation-adjusted $549 billion cost of the Vietnam War.