OKLAHOMA CITY – APRIL 19: Two-year-old Lora Korrell touches one of the chairs representing a victim of the 1995 bombing of the Alfred P. Murrah Federal Building, in the “Field of Empty Chairs” at the Oklahoma City National Memorial April 19, 2005 in Oklahoma City, Oklahoma. April 19, 2005 is the 10th anniversary of the morning when Timothy McVeigh ignited a 4,800-pound fertilizer truck bomb that killed 168 people in what was, at the time, the worst terror attack in U.S. history. (Photo by Win McNamee/Getty Images)