Afghan National Police

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Afghan National Police officers march during a graduation ceremony at a training center in Jalalabad, Afghanistan. (Associated Press)

Afghan policemen keep watch from atop city police headquarters in Kabul, Afghanistan, on Monday, Dec. 24, 2012, following the killing of an American adviser by an Afghan policewoman, according to a senior Afghan police official. (AP Photo/Musadeq Sadeq)

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Afghan police stand guard at Kabul police headquarters, where a U.S. civilian adviser was killed by an Afghan policewoman who shot him once in the chest. (Associated Press)

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Afghan police stand guard outside police headquarters in Kabul, Afghanistan, where an American adviser was killed, authorities said, by an Afghan policewoman on Monday, Dec. 24, 2012. (AP Photo/Musadeq Sadeq)

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** FILE ** U.S. Army Sgt. William Womack, 23, of Batesville, Ga., of the 118th Military Police Company, based at Fort Bragg, N.C., is prone during a training session for the Afghan National Police at a combat outpost in the Jalrez Valley in Afghanistan's Wardak Province in 2009. (AP Photo/Maya Alleruzzo)

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Afghan police officers line up to wash their hands before breakfast at the police academy in Kabul, Afghanistan. (AP Photo/Anja Niedringhaus)

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Afghan National Police officers line up for breakfast after prayers at the police academy in Kabul, Afghanistan. (AP Photo/Anja Niedringhaus)

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Afghan National Police officers navigate a ropes course during a training session at the police academy in Kabul, Afghanistan. (AP Photo/Anja Niedringhaus)

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Afghan National Police officers line up with their tea glasses before breakfast at the Police Academy in Kabul, Afghanistan, on Tuesday, Oct. 9, 2012. (AP Photo/Anja Niedringhaus)

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Afghan Police officers inspect the scene after a bomb explosion in the city of Jalalabad east of Kabul, Afghanistan, Monday, Aug. 13, 2012. At least five civilians were injured as a bomb targeting a government employees' bus went off Monday morning, a police source said. (AP Photo/Rahmat Gul)

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Afghan police inspect the scene after a bombing in Jalalabad, Afghanistan, on Monday, Aug. 13, 2012. At least five civilians were injured as a bomb targeting the government-employee vehice went off, a police source said. (AP Photo/Rahmat Gul)