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Join us for the next G2G Dinner with Marcel Lettre! Marcel Lettre served as the fourth Under Secretary of Defense for Intelligence (USDI) from December 2015 until January 2017. As the USDI, Secretary Lettre was the principal intelligence advisor to the Secretary of Defense. He exercised authority, direction, and control on behalf of the Secretary of Defense over all intelligence and security organizations within the Department of Defense, including the National Security Agency, the Defense Intelligence Agency, the National Geospatial Intelligence Agency, the National Reconnaissance Office, the Defense Security Service and the intelligence components of the combatant commands and military...