The United States Army Intelligence Support Activity, frequently shortened to Intelligence Support Activity, also known at various times as Joint Reconnaissance Evaluation Group, Mission Support Activity, Office of Military Support, Field Operations Group, Studies and Analysis Activity, Tactical Concept Activity, Tactical Support Team, and 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. Wikipedia