This undated photo provided by the U.S. Marines shows Lance Cpl. Mason J. Vanderwork of Hickory, N.C. Vanderwork, 21, was killed with six other Marines in an explosion during a Nevada training exercise on Monday, March 18, 2013. (AP Photo/U.S. Marines)

Associated Press
This undated photo provided by the U.S. Marines shows Lance Cpl. Mason J. Vanderwork of Hickory, N.C. Vanderwork, 21, was killed with six other Marines in an explosion during a Nevada training exercise on Monday, March 18, 2013. (AP Photo/U.S. Marines)
This undated photo provided by the U.S. Marines shows Lance Cpl. Mason J. Vanderwork of Hickory, N.C. Vanderwork, 21, was killed with six other Marines in an explosion during a Nevada training exercise on Monday, March 18, 2013. (AP Photo/U.S. Marines)
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