The U.S. Diplomatic Security Service (DSS) is the federal law enforcement arm of the U.S. Department of State. The majority of its Special Agents are members of the Foreign Service and federal law enforcement agents at the same time, making them unique.
The Bureau of Diplomatic Security, more commonly known as Diplomatic Security, or DS, is the parent organization of the Diplomatic Security Service. Both terms, DSS or DS, are used interchangeably within the State Department and other agencies to refer to the DSS. The DSS is structured as a federal law enforcement agency, primarily made up of U.S. Federal Agents mandated to serve overseas and domestically. DSS is the most widely represented U.S. law enforcement agency world wide.