Delta Force Delta Force The 1st Special Forces Operational Detachment-Delta (1st SFOD-D), commonly referred to as Delta Force, Combat Applications Group (CAG), "The Unit", Army Compartmented Element (ACE), or within JSOC as Task Force Green, is an elite special mission unit of the United States Army, under operational control of the Joint Special Operations Command. The unit is tasked with specialized missions primarily involving hostage rescue and counter-terrorism, as well as direct action and special reconnaissance against high-value targets. Delta Force and its maritime counterpart, the U.S. Navy's SEAL Team Six (also known as "DEVGRU"), are the U.S. military's primary counterterrorism units.
Active service unit Brigade which retained its traditional hierarchy and battalion structure and used relatively large numbers of volunteers in its actions. Some operations, like the attack on Cloghogue checkpoint or the South Armagh sniper squads, involved as many as 20 volunteers, most of them in supporting roles. Active service unit An Active Service Unit (ASU) was a Provisional Irish Republican Army (IRA) cell of five to eight members, tasked with carrying out armed attacks. In 2002 the IRA had about 1,000 active members of which about 300 were in active service units. In 1977, the IRA moved away from the larger conventional