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Arizona National Guardsmen guard the U.S. border with Mexico

Nice photo essay from Getty Images photographer John Moore showing Arizona National Guardsmen on the U.S. border with Mexico. According to Moore,  there are a series of tunnels which run from the Mexican side into the U.S. that were designed to prevent flooding, but now used frequently by drug smugglers to transport their product into the United States. 

John Moore / Getty Images

U.S. Border Patrol agents search for footprints in a drainage tunnel that runs under the U.S.- Mexico border on December 7, 2010 in Nogales, Arizona.

John Moore / Getty Images

U.S. Border Patrol agent Colleen Agle (L) searches for evidence of drug smugglers in a drainage tunnel that runs under the U.S.- Mexico border in Nogales, Arizona.

John Moore / Getty Images

An Arizona National Guardsman watches over the U.S. border with Mexico at an observation post in Nogales, Arizona.

John Moore / Getty Images

Arizona National Guardsmen watch over the U.S. border with Mexico at an observation post in Nogales, Arizona.

John Moore / Getty Images

An Arizona National Guardsman watches over the U.S. border with Mexico at an observation post in Nogales, Arizona.