FRONTLINE Losing Iraq +ADD Aired: 07/29/201401:24:10Rating: NR U.S. troops withdrew from Iraq in 2011, ending America’s military commitment in the country. Now, chaos is once again engulfing Iraq. The team behind "The Lost Year in Iraq," "The Torture Question" and "Bush's War" takes a look at how we got here, what went wrong, and what happens next.