Pakistani military and police officials cordoned off a street in Abbottabad near the compound where Osama Bin Laden was found and killed. (May 8, 2011, file photo.)
Asif Hassan /AFP/Getty Images
Corporal Daniel Wheeler, Bravo Co. 1/5 Marines, walks through a waist high wheat field on a patrol in Sangin District near the Helmand River in southern Afghanistan earlier this month.
David Gilkey /NPR
An image from an undated video released by the Department of Defense on May 7, 2011. Videos of Osama bin Laden and other materials were seized during the raid on his compound in Pakistan, during which the al-Qaida leader was killed by U.S. commandos.