Directorate of Operations (CIA)

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.