A stone of remembrance sits on the gravestone of Army Pvt. William Christman, who was the first military burial at the cemetery, marking the beginning of commemorations of the 150th anniversary of Arlington National Cemetery in Arlington, Va., Tuesday, May 13, 2014. The stone is from the original Christman home that still stands in Pocono Lake, Pennsylvania. Christman, 20, enlisted in the 67th Pennsylvania Infantry and was hospitalized for measles five weeks later, dying on May 11, 1864 and buried at Arlington on May 13. (AP Photo)
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