The Bush Administration was wrong about the benefits of the war and it was wrong about the costs of the war. The president and his advisers [forecast] a quick, inexpensive conflict. Instead, we have a war that is costing more than anyone could have imagined. The cost of direct US military operations - not even including long-term costs such as taking care of wounded veterans - already exceeds the cost of the 12-year war in Vietnam and is more than double the cost of the Korean War. And, even in the best case scenario, these costs are projected to be almost ten times the cost of the first Gulf War, almost a third more than the cost of the Vietnam War, and twice that of the First World War. The only war in our history which cost more was the Second World War, when 16.3 million U.S. troops fought in a campaign lasting four years, at a total cost (in 2007 dollars, after adjusting for inflation) of about $5 trillion. Most Americans have yet to feel these costs. The price in blood has been paid by our voluntary military and by hired contractors. The price in treasure has, in a sense, been financed entirely by borrowing. Taxes have not been raised to pay for it - in fact, taxes on the rich have actually fallen. Deficit spending gives the illusion that the laws of economics can be repealed, that we can have both guns and butter. But of course the laws are not repealed. The costs of the war are real even if they have been deferred, possibly to another generation. From the unhealthy brew of emergency funding, multiple sets of books, and chronic underestimates of the resources required to prosecute the war, we have attempted to identify how much we have been spending - and how much we will, in the end, likely have to spend. The figure we arrive at is more than $3 trillion. Our calculations are based on conservative assumptions.