Afghanistan

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President Obama (right) shakes hands with Afghan President Hamid Karzai during their meeting at the NATO summit in Chicago on Sunday, May 20, 2012. (AP Photo/Pablo Martinez Monsivais)

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** FILE ** Afghan security men and NATO soldiers (right) are seen at the scene of an attack by militants in Kabul, Afghanistan, on Wednesday, May 2, 2012. (AP Photo/Musadeq Sadeq)

Margaret Nelson, center, from Evanston, Ill., joins about 100 anti-war activists as they march down Michigan Avenue after rallying outside President Barack Obama's campaign headquarters in downtown Chicago, protesting for an end to NATO operations in Afghanistan, Thursday, May 17, 2012, in Chicago. (AP Photo/Charles Rex Arbogast)

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Pakistanis sit atop idle oil tankers that had been used to transport NATO fuel supplies to Afghanistan, while watching a cricket match (upper right) in Karachi, Pakistan, on Wednesday. A deal is said to be near that would reopen supply lines into Afghanistan that have been closed since November. That may explain an invitation to Pakistani President Asif Ali Zardari (left) to a NATO summit. (Associated Press)

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Staff Sgt. Marie Martinson, one of two female bomb techs in the 88th Air Base Wing Explosive Ordnance Disposal unit at Wright Patterson Air Force Base in Ohio, is seen here in Afghanistan with a robot pack beside her. (U.S. Air Force)

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** FILE ** U.S. Secretary of State Hillary Rodham Clinton (second from right) meets Salahuddin Rabbani during a Civil Society round-table discussion at the U.S. Embassy in Kabul, Afghanistan, on Thursday, Oct. 20, 2011. (AP Photo/Kevin Lamarque, Pool)

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Afghan National Army soldiers secure the gate of the military hospital after Arsala Rahmani, a former Taliban official who became an Afghan peace negotiator, was killed by an unknown attacker in western Kabul, Afghanistan, on Sunday, May 13, 2012. (AP Photo/Rahmat Gul)

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** FILE ** During a training session at Camp Morehead on the outskirts of Kabul, Afghanistan, in March 2011, Afghan National Special Force soldiers stand on tanks that were destroyed in the Soviet occupation and civil war. (AP Photo/Dar Yasin, File)

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** FILE ** A NATO coalition soldier carries a sniffer dog after a gunbattle in Kabul, Afghanistan, on Monday, April 16, 2012. (AP Photo/Musadeq Sadeq)