Chadian troops participate along with Nigerian special forces watched by a US special forces soldier, at right, in an hostage rescue exercise at the end of the Flintlock exercise in Mao, Chad, Saturday, March 7, 2015. The U.S. military and its Western partners conduct this training annually and set up plans long before Boko Haram began attacking its neighbors Niger, Chad and Cameroon. (AP Photo/Jerome Delay)

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