The United States Army Intelligence Support Activity or
USAISA has lots of nicknames - one of them is "The Activity".
The organization was initially a part of the U.S. Army
Intelligence and Security Command (INSCOM); it would later fall
under the Joint Special
Operations Command (JSOC). It's mission was to collect
actionable intelligence overseas that could be used by other
United States special operations forces.
Others Names. In keeping with the objective of remaining
secret the ISA has been called a number of different names (a
code names) to include Gray Fox, Field Operations Group (FOG),
Task Force Orange, Mission Support Activity, and many others.
The ISA, or - at the time, FOG - was established to collect
intelligence in Iran for a possible second rescue attempt of the
hostages held in the U.S. embassy in Tehran in 1981. After the
rescue attempt was cancelled and the hostages released FOG was
continued and enlarged.
Personnel. Most, but not all personnel, are selected from the
U.S. Army Special Forces ranks. The ISA has an very demanding
selection course for those who seek to join the organization.
Once selected the personnel are further schooled up in HUMINT
and SIGINT procedures and skills.
Websites about the ISA
Intelligence Support Activity by WikipediA
Papers about the ISA
Richelson, Jeffrey T., "Truth Conquers All Chains": The U.S.
Army Intelligence Support Activity, 1981-1989",
International Journal of Intelligence, Vol. 12, No.2, 1999,