Estimates of the total long-term economic costs of the Iraq and Afghanistan wars vary wildly and remain hotly disputed among experts.

Iran’s influence in Iraq is the subject of enormous speculation. The United States is taking steps to counter that influence.

Gen. David Petraeus’ assertions about falling casualties in Iraq are supported by a range of objective sources. But his testimony to Congress does not establish whether the decline is attributable to…

The U.S. military’s methodology for measuring violence in Iraq draws criticism from some quarters. The Pentagon concedes some kinds of violence don’t get included, but insists its consistent applic…

Since 9/11, much of al-Qaeda’s operational capacity has been dismantled but experts say the group’s strength now lies in its ability to inspire others to carry out terrorist attacks.