President Barack Obama delivers remarks to the Nunn-Lugar Cooperative Threat Reduction symposium (December 3, 2012)

President Barack Obama delivers remarks to the Nunn-Lugar Cooperative Threat Reduction symposium held at the National Defense University at Fort McNair in Washington, D.C., Dec. 3, 2012. Joing the President on stage are, from left: Defense Secretary Leon Panetta; former Sen. Sam Nunn, D-Ga.; and Sen. Richard Lugar, R- Ind.(Official White House Photo by Sonya N. Hebert)