The Department of State's Diplomatic Security protects people, information and property with over 400 locations world-wide and has experienced a large growth in its budget and personnel over the last decade. Diplomatic Security trains its workforce and others to address a variety of threats, including crime, espionage, visa and passport fraud, technological intrusions, political violence and terrorism. In response to the 1998 bombings of two U.S. embassies, the Department of State embarked on a multiyear, multi-billion dollar program to replace insecure and dilapidated diplomatic facilities. Since 2001, the Department of State has constructed 52 new embassy compounds under this program, and moved over 21,000 U.S. government personnel into more secure and safe facilities. This book provides an overview of diplomatic security expanded missions and inadequate facilities that pose challenges to training efforts.