A Century of US Diplomatic Security: An Evolutionary Response to a Changing Threat Environment

Academic chapter/article/Conference paper
Defence  Security policy  Terrorism and extremism  Diplomacy  Foreign policy  North America
Written by

Patrick J. Cullen

Former employee


This chapter traces nearly 100 years of US Diplomatic Security from its pre-WWI origins up to the Obama Administration, describing the key drivers of its qualitative and quantitative expansion through the Cold War into the post 9-11 world. It offers a detailed breakdown of the various roles and missions of the State Department's Bureau of Diplomatic Security, as well as the ancillary diplomatic security role played by the US military.