USAISA was the official name of the unit from 1981 to 1989. military's premier Tier 1 Special Mission Units, performing the most complex, classified, and dangerous missions as directed by the National Command Authority. The Activity and its counterparts 1st SFOD-D, DEVGRU, and the 24th Special Tactics Squadron, are the U.S. 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. Within JSOC, the unit is often referred to as Task Force Orange.

The United States Army Intelligence Support Activity ( USAISA), frequently shortened to Intelligence Support Activity (ISA), also known at various times as Joint Reconnaissance Evaluation Group (JREG), 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).

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