Former President Bill Clinton stands in the Field of Empty Chairs at the chair of Oklahoma City bombing victim Alan G. Whicher,of the U.S. Secret Service, after lying a bouquet of flowers on the chair during a visit to the Oklahoma City National Memorial in Oklahoma City. (AP Photo/Bryan Terry, Pool)
Oklahoma Gov. Mary Fallin speaks at the Oklahoma City National Memorial & Museum in Oklahoma City on Tuesday, April 19, 2011, to commemorate the 16th anniversary of the bombing of the Alfred P. Murrah Federal Building. (AP Photo/Sue Ogrocki)