I'm not so sure on the accuracy this. It includes expanded homeland security operations as a war cost, evn though these are domestic measures that would be needed even without active military operations, and I don't see any sign that the costs of new veterans created by post-9/11 operations are being filtered correctly from the veterans of past wars. Not a 100% sure on adding interest either considering the U.S's attitude on deficit spending as a whole, but I am open to be convinced otherwise.

Still a hell of a lot more than the official number.