Regional Security Officer
Regional Security Officer (RSO) is the title given to special agents of the U.S. Diplomatic Security Service (DSS) serving overseas. The RSO is the principal security attaché and advisor to the U.S. Ambassador at American Embassies and consulates. Working for the U.S. Department of State as special agents, RSOs are also considered officers within the State Department acting as specialists within the United States Foreign Service. The RSO is also the senior law enforcement representative at a U.S. Embassy.