Iraqi soldiers walk in Jurf al-Sakhr, south of the capital Baghdad, on Monday after Iraqi military forces retook the area from Islamic State militants. Iraqi forces, supported by U.S. airstrikes, have made limited gains in recent months, but critics are questioning whether the U.S. strategy is likely to succeed. Haidar Mohammed Ali/AFP/Getty Images hide caption

itoggle caption Haidar Mohammed Ali/AFP/Getty Images

Secret Service respond on the North Lawn of the White House after a man jumped the White House fence Wednesday night. This latest incident comes about a month after a previous fence-jumper sprinted across the lawn, past armed uniformed agents, and entered the Executive Mansion. Jacquelyn Martin/AP hide caption

itoggle caption Jacquelyn Martin/AP

Former Blackwater Worldwide guard Nicholas Slatten leaves federal court in Washington in June. Slatten on Wednesday was found guilty of first-degree murder in the deaths of 14 Iraqi civilians in 2007. Cliff Owen/AP hide caption

itoggle caption Cliff Owen/AP

A Free Syrian Army fighter runs after attacking a tank with a rocket-propelled grenade during fighting in Aleppo, Syria, in September 2012. The rebels say they are willing to take on the Islamic State, but need more weapons. Manu Brabo/AP hide caption

itoggle caption Manu Brabo/AP