U.S. Air Force fatigues seized from the Zetas drug cartel, along with hand grenades, firearms, and cocaine, on display on June 9, 2011, in Mexico City.
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A Mexican Army soldier trains at the National Training Center in Santa Gertrudis, in Chihuahua state, on July 16, 2011.
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A National Guardsman watchers over the U.S. border with Mexico in Nogales, Arizona, on Dec. 7, 2010.
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