August 6th marked the 65th anniversary of the bombing of Hiroshima. Three days later, 65 years ago today, a second bomb was dropped on Nagasaki. Over 200,000 people were killed by the two atom bombs. Friday, the city of Hiroshima held its annual Peace Memorial Ceremony to commemorate the bombing and for the first time the United States sent a representative to attend the ceremony, Ambassador to Japan, John Roos. While Roos attendance demonstrates President Obama’s commitment to nuclear disarmament, only a few days early, the START treaty, the Strategic Arms Reduction Treaty between the U.S. and Russia, stalled in the Senate. President Obama has made nonproliferation a central goal of his administration, but are we actually gaining any ground? What is the state of nuclear security in the world? And who poses the biggest threat? Our guests are two nuclear arms experts and advocates for nonproliferation: Ploughshares President JOSEPH CIRINCIONE and World Security Institute President BRUCE BLAIR.