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Photo by: Sang Tan

U.S. Army Gen. David H. Petraeus, commander of U.S. and NATO forces in Afghanistan, addresses the Royal United Services Institute in London on Wednesday, March 23, 2011. Gen. Petraeus said foreign troops are on course to complete their security role in Afghanistan by the end of 2014, but he has warned that progress easily could be reversed. (AP Photo/Sang Tan)

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