6 of 7: In this undated photo released by the U.S. Marine Corps via the Marietta Times, Marine Lance Cpl. Josh Taylor poses for a photograph. Taylor 21, with the 2nd Marine Expeditionary Force from Camp Lejeune, N.C., was killed with 6 other Marines after mortar shell exploded during a training exercise at the Hawthorne, Nev., Army Depot. (AP Photo/U.S. Marine Corps)

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