The
Directorate of Operations (
DO), less formally called the
Clandestine Service, is one of the main components of the US
Central Intelligence Agency. It was known as the
Directorate of Plans from 1951 to 1973; as the
Directorate of Operations from 1973 to 2005; and as the
National Clandestine Service (NCS) from 2005 to 2015.