Military intelligence branch, naval focus.

The Intelligence Support Activity, also known at various times as Mission Support Activity, Office of Military Support, Field Operations Group, Studies and Analysis Activity, Tactical Concept Activity, Tactical Support Team, Tactical Coordination Detachment, and also nicknamed "The Activity" and the "Army of Northern Virginia", is a United States Army Special Operations unit which serves as the intelligence gathering component of Joint Special Operations Command.

The Government of China is engaged in espionage overseas, directed through diverse methods via the Ministry of State Security, the Ministry of Public Security, the United Front Work Department, People's Liberation Army via its Intelligence Bureau of the Joint Staff Department, and numerous front organizations and state-owned enterprises.

an organization, within the Office of the Director of National Intelligence, that is responsible for leading research to overcome difficult challenges facing the United States Intelligence Community.