CIA SAD 15

and i quote:

"The Special Activities Division (SAD) is a division of the Central Intelligence Agency's former Directorate of Operations, now the National Clandestine Service, responsible for covert paramilitary operations, effected when the US Government does not wish to be overtly associated with such activities. As such, members of the unit, when on missions, normally do not carry any objects or clothing that would associate them with the United States. SAD has been changed to Special Services Office in recent years. In short - Black Ops!!"

source: [link]