David Merker (speaking), Senior Executive Service Director of the U.S. National Data Center, discusses nuclear treaty monitoring verification with U.S. Secretary of Energy Ernest J. Moniz (left) and Dr. Lassina Zerbo (right), Executive Secretary of the Preparatory Commission for the Comprehensive Test Ban Treaty Organization, at an event on Capitol Hill in Washington D.C., Nov. 30, 2016. Merker, also the Director of the Air Force Technical Applications Center's Treaty Monitoring Directorate at Patrick AFB, Fla., met with senior officials to participate in the National Nuclear Security Administration's "Nuclear Explosion Monitoring: 60 Years of Science and Innovation" conference. (Photo courtesy of the National Nuclear Security Administration)
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