The United States Army Intelligence Support Activity (USAISA), frequently shortened to Intelligence Support Activity (ISA), also known at various times as Mission Support Activity (MSA), Office of Military Support (OMS), Field Operations Group (FOG), Studies and Analysis Activity (SAA), 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 (JSOC). Within JSOC, the unit is often referred to as Task Force Orange. Originally subordinated to the US Army Intelligence and Security Command (INSCOM), it is one of the least known intelligence components of the United States military, tasked with clandestine HUMINT operations and collecting actionable intelligence during or prior to JSOC missions.

United States special operations forces (SOF) are the active and reserve component forces of the United States Army, Marine Corps, Navy and Air Force within the US military, as designated by the Secretary of Defense and specifically organized, trained, and equipped to conduct and support special operations. All active and reserve special operations forces are assigned to the United States Special Operations Command (USSOCOM).