A CH-47 Chinook helicopter crew chief watches the terrain during an air assault mission to the District Center of Daymirdad, Wardak province, Afghanistan, Jan. 9, 2011. (U.S. Army photo by Sgt. Sean P. Casey/Released)
A CH-47 Chinook helicopter crew chief watches the terrain during an air assault mission to the District Center of Daymirdad, Wardak province, Afghanistan, Jan. 9, 2011. (U.S. Army photo by Sgt. Sean P. Casey/Released)