The U.S. Diplomatic Security Service (DSS) is the federal law enforcement arm of the United States 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 senior, administrative and political face of the Diplomatic Security Service. Both terms, DSS or DS, are used interchangeably inside and outside the State Department to refer to the DSS. The Diplomatic Security Service 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. - Source: Wikipedia
