December 3, 2012
U.S. President Barack Obama addresses the Nunn-Lugar Cooperative Threat Reduction (CTR) symposium December 3, 2012 at the National Defense University in Washington, DC. Obama spoke on the 20th anniversary of the CTR program which was established to secure and dismantle weapons of mass destruction and their associated infrastructure in former Soviet Union states.” Obama also warned President Assad of Syria not to use chemical weapons against his people. (Getty)