Defense Secretary Leon Panetta looks on at left as Joint Chiefs Chairman Adm. Michael Mullen testifies Thursday in Washington. Harry Hamburg/AP hide caption

itoggle caption Harry Hamburg/AP

U.S Treasury Secretary Timothy Geithner (left) speaks to French Finance Minister Francois Baroin (right) during talks in Marseille earlier this month. The U.S. is increasingly concerned that the European debt crisis will have an impact on the U.S. economy. Lionel Cironneau/AP hide caption

itoggle caption Lionel Cironneau/AP

The Louis S. St Laurent icebreaker slices its way through the ice of the Northwest Passage. Jackie Northam/NPR hide caption

itoggle caption Jackie Northam/NPR

A model of a surveillance drone by the French Dassault Aviation and the British BAE Systems is on display at the International Paris Air Show in June. Pierre Verdy/AFP/Getty Images hide caption

itoggle caption Pierre Verdy/AFP/Getty Images

A local resident walks Wednesday near Osama bin Laden's compound in Abbottabad, Pakistan. The U.S. raid that killed bin Laden has been a source of tension in U.S.-Pakistani relations. Aqeel Ahmed/AP hide caption

itoggle caption Aqeel Ahmed/AP