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General John Allen the top U.S. commander in Afghanistan observes Memorial Day by reading a letter written by an American soldier to his family before he died earlier this year at the ISAF headquarters in Kabul Afghanistan Monday May 28 2012 (Credit: AP/Anja Niedringhaus)

General John Allen the top U.S. commander in Afghanistan observes Memorial Day by reading a letter written by an American soldier to his family before he died earlier this year at the ISAF headquarters in Kabul Afghanistan Monday May 28 2012 (Credit: AP/Anja Niedringhaus)