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This undated photo provided by the U.S. Marines shows Cpl. Aaron Ripperda of Highland, Ill. Ripperda was killed with six other Marines in an explosion during a Nevada training exercise on Monday, March 18, 2013. (AP Photo/U.S. Marines)

Marines killed in Nevada explosion identified

The seven Marines killed in a training exercise explosion in Nevada this week ranged in age from

19 to 26, most of them veterans of the war in Afghanistan.