President Obama, accompanied by Commons Speaker John Bercow and Lords Speaker Baroness Helen Hayman, as he entered Westminster Hall. Nicholas Kamm /AFP/Getty Images hide caption

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President Obama, during his address at the State Department on Thursday (May 19, 2011). Jim Watson /AFP/Getty Images hide caption

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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 hide caption

itoggle caption David Gilkey /NPR