President Barack Obama thanks Sen. Richard Lugar of Indiana, center right, and former Sen. Sam Nunn of Georgia, center, for their work to help in denuclearizing countries after the fall of the Soviet Union at the National Defense University in Washington D.C., Dec. 3, 2012. Prior to the president's speech, Defense Secretary Leon E. Panetta, left, presented Nunn and Lugar with the Defense Civilian Service Award, the highest award the Defense Department can give a civilian. DOD photo by Erin Kirk-Cuomo |