Afghanistan's Chief Executive Officer Abdullah Abdullah (left) stands with President Ashraf Ghani, Vice President Joe Bidden, Defense Secretary Ash Carter and Maj. Gen. Jeffrey Buchanan at a wreath-laying ceremony at the Tomb of the Unknowns on Tuesday. Andrew Harnik/AP hide caption

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A cell block at the now-closed Abu Ghraib prison in Baghdad, a facility notorious for photos released in 2004 showing U.S. soldiers torturing and humiliating inmates. Karim Kadim/AP hide caption

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Heavy smoke rises following an airstrike by the U.S.-led coalition aircraft in Kobani, Syria, during fighting between Syrian Kurds and the militants of the self-declared Islamic State in October 2014. Gokhan Sahin/Getty Images hide caption

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Afghanistan's Shapoor Zadran celebrates as he leaves the field after guiding his team to victory against Scotland in the Pool A game of the Cricket World Cup in Dunedin, New Zealand, on Thursday. Dianne Manson/AP hide caption

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U.S. Defense Secretary Ash Carter (center left) is greeted with a military honor guard as he arrives to meet Afghan President Ashraf Ghani at the Presidential Palace in Kabul, Afghanistan, on Saturday. Jonathan Ernst/AP hide caption

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Lebanese-born Rula Ghani is Afghanistan's first lady. The wife of newly elected Afghan President Ashraf Ghani has her own office in the presidential palace and intends to play a prominent role in public life. Emily Jan/NPR hide caption

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President George W. Bush addressed a joint session of Congress shortly after the Sept. 11 attacks, vowing to tap "every resource" to fight terrorism. Two days before the speech, he had signed an Authorization for Use of Military Force passed by Congress. WIN MACNAMEE/AFP/Getty Images hide caption

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Afghan war rugs reflect the nation's long history of conflict through one of its most ancient art forms. Courtesy of Kevin Sudeith hide caption

itoggle caption Courtesy of Kevin Sudeith