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Karen Clarkson lies over her slain son's grave at the National Cemetery on Memorial Day in Arlington, Va. Her son, Sgt. Joel Clarkson, was serving as an Army Ranger team leader in Afghanistan when he was shot and killed in March 2010. Karen was one of some 1,200 adults, most of whom are grieving parents and spouses, attending the TAPS National Military Survivor Seminar held concurrently with a "Good Grief Camp" for military children in Arlington.