Afghanistan

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FILE - This May 25, 2014 file photo shows President Barack Obama speaking during a troop rally after arriving at Bagram Air Field for an unannounced visit, north of Kabul, Afghanistan. Senior U.S. administration officials say President Barack Obama will seek to keep 9,800 U.S. troops in Afghanistan after the war formally ends later this year. Nearly all of those forces are to be out by the end of 2016, as Obama finishes his second term. (AP Photo/ Evan Vucci, File)

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Afghanistan's National Army (ANA) soldiers stand guard at the site of a suicide attack in Kabul, Afghanistan, Monday, May 26, 2014. A suicide bomber riding a motorcycle on Monday killed at least two Afghan defense ministry staffers and wounded at least several others after he rammed a bus carrying soldiers and civilian employees who were returning home from work. (AP Photo/Massoud Hossaini)

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Afghanistan's National Army (ANA) soldiers stand guard at the site of a suicide attack in Kabul, Afghanistan, Monday, May 26, 2014. A suicide bomber riding a motorcycle on Monday killed at least two Afghan defense ministry staffers and wounded at least several others after he rammed a bus carrying soldiers and civilian employees who were returning home from work. (AP Photo/Massoud Hossaini)

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FILE - This May 2, 2012 file photo shows President Barack Obama addressing troops at Bagram Air Field, Afghanistan. President Obama has made a surprise trip to Afghanistan for a Memorial Day weekend visit with U.S. troops serving in America’s longest war.(AP Photo/Charles Dharapak)