This important, anxious-making portrait of American soldiers in Afghanistan in 2007 and 2008 does nothing to address the larger political picture of the ongoing warโ€”it simply takes you into combat with some extraordinarily brave guys. The interviews are wrenching, and the footage of the soldiers under fire, sweating, sleeping, being bored, arguing with Afghan elders over a dead cow, burning their own feces, and dying is so intimate, you wonder how the hell the documentary cameramen (Sebastian Junger and Tim Hetherington) didn't die capturing it. (Harvard Exit, 807 E Roy St, 6:30 pm, $11.)