Afghans hold portraits of former President Burhanuddin Rabbani, as they shout anti-government slogans during a demonstration in Kabul on Tuesday. Last week's killing of Rabbani, an ethnic Tajik, was the latest targeting his party and it has stoked fears of increased factionalism. Shah Marai/AFP/Getty Images hide caption

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Jalaluddin Haqqani, founder of the Haqqani Network, speaks during an interview in Miram Shah, Pakistan, in 1998. His militant network has thrived and is now considered the No. 1 threat to American troops in Afghanistan. Mohammad Riaz/AP hide caption

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An Afghan police officer looks at a police vehicle damaged in a suicide attack Tuesday in Lashkar Gah, Helmand province. Abdul Khaleq/AP hide caption

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During a patrol in 2009, Gen. Abdul Raziq of Afghanistan's border police (center) talks with U.S. Lt. Col. William Clark near the Afghan border with Pakistan. Emilio Morenatti/AP hide caption

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Afghans carry the coffin of Afghanistan High Peace Council head and former President Burhanuddin Rabbani during his burial ceremony in Kabul, Sept. 23. A suicide bomber assassinated Rabbani on Sept. 20, which further complicates the thorny issue of negotiating with the Taliban. Ahmad Masood/AFP/Getty Images hide caption

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Defense Secretary Leon Panetta looks on at left as Joint Chiefs Chairman Adm. Michael Mullen testifies Thursday in Washington. Harry Hamburg/AP hide caption

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Sakina sits with her 18-month-old son, Shafiq, at a women's shelter in Bamiyan, in central Afghanistan, last October. Sakina spent seven months in prison for leaving a forced marriage. The Afghan government recently backed down from a plan to take control of women's shelters, and women's groups are hailing it as a victory. Paula Bronstein/Getty Images hide caption

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Afghan security personnel carry a wounded colleague across a street in Kabul on Sept. 14, after Taliban fighters attacked the most heavily protected part of the Afghan capital. Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, said Thursday before a Senate panel that the Haqqani network of militants, supported by Pakistan, was responsible for this attack, among others. ShahMarai /AFP/Getty Images hide caption

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Protesters in Kabul demonstrate against the results of last September's parliamentary poll, Jan. 23. A year after the elections were held, Afghan President Hamid Karzai and lawmakers are still fighting over the results, and the Parliament has accomplished very little. Musadeq Sadeq/AP hide caption

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For the first seven years of the war in Afghanistan, almost all U.S. and NATO supplies were trucked overland to Afghanistan through parts of Pakistan effectively controlled by the Taliban. Here, smoke and flame rise from a burning NATO supplies oil tanker after armed militants torched the tankers in Mithri, Pakistan, in February. STR/AFP/Getty Images hide caption

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