We meet John Nicholson, Trump's top general in Afghanistan, to find out if the conflict can ever be brought to an end.
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The uncle and cousin of injured student Mohammad Baqair, center, comfort him as he mourns the death of his mother who was a teacher at the school which was attacked by Taliban, in Peshawar, Pakistan, Tuesday, Dec. 16, 2014. (AP PHOTO/MOHAMMAD SAJJAD)