U.S. troops patrol in the Baraki Barak district of Logar province, Afghanistan. Sean Carberry/NPR hide caption

itoggle caption Sean Carberry/NPR

A soldier from the U.S. Army's 101st Airborne Division on patrol in southern Afghanistan. (October, 2010, file photo.) Chris Hondros/Getty Images hide caption

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From video of the incident, as the helicopter swooped low over a snowy base in Afghanistan moments before crashing in the distance. YouTube.com hide caption

itoggle caption YouTube.com

An elderly Afghan man sits next to the covered body of a person who was allegedly killed by a U.S. service member in Panjwai, Kandahar province south of Kabul, Afghanistan, on Sunday, March 11, 2012. Allauddin Khan/AP hide caption

itoggle caption Allauddin Khan/AP

An Afghan demonstrator holds a copy of a half-burnt Quran, allegedly set on fire by soldiers at Bagram Air Field, during a protest outside the base today. Massoud Hossaini /AFP/Getty Images hide caption

itoggle caption Massoud Hossaini /AFP/Getty Images