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File:Bureau of Diplomatic Security Deputy Assistant Secretary Chris Gu Speaks at the Commemoration of the 20th Anniversary of the 9 11 Attacks (51443073413).jpg - Wikimedia Commons
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The Diplomatic Security Service: On the Front Lines of Transnational Investigations - United States Department of State
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Diplomatic Security: State Should Enhance Its Management of Transportation-Related Risks to Overseas U.S. Personnel | U.S. GAO
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