Blackwater security contractors are seen in a helicopter in Baghdad in 2007. The company changed its name to Xe in 2009, amid controversy surrounding the killing of 17 Iraqi civilians in 2007. Khalid Mohammed/AP hide caption

itoggle caption Khalid Mohammed/AP

A Pakistani shepherd in Abbottabad walks past the hideout of al-Qaida leader Osama bin Laden, who was killed in a U.S.-led ground operation early Monday. Aamir Qureshi/AFP/Getty Images hide caption

itoggle caption Aamir Qureshi/AFP/Getty Images