The best way to start winning a war is to stop losing. That axiom certainly applies to what's going on in Iraq. But, that said, there is no place for American brigades in this battle.
Yes, Americans have a huge stake in preventing al-Qaida's cousin from setting up a brutal caliphate in Iraq. The Middle East is a crossroads of the world. If unchecked, the malevolent influence of the Islamic State could spiral into a sectarian conflict engulfing the entire region.
By some estimates, there are now more than 10,000 foreign fighters in Iraq, including more than 3,000 from the U.S. and other Western nations. These fighters may, in future, be reassigned to return home and wage terrorist campaigns. No matter how you slice it, the longer a terrorist state stands in Iraq, the bigger the problem it poses to the world and to us.