The miscalculations in Iraq and Afghanistan hang in the air as we weigh up whether to attack Syria. Of course, no situation is ever quite the same, and in this case the president is not urging a full-fledged invasion, just air and naval attacks. But after more than a decade of inconclusive war in the region, comparisons are inevitable.
Bilmes, Linda J. "The Cost of Striking Syria: 4 Lessons from Iraq and Afghanistan." Cognoscenti, September 6, 2013.