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.
Counter-intelligence and counter-terrorism organizations Counterintelligence, the Air Force Office of Special Investigations (AFOSI),and the Naval Criminal Investigative Service (NCIS), formerly (NIS). NCIS serves the US Marine Corps. NOTE: The U.S. Marine Corps also has Counterintelligence/Tactical HUMINT assets (CI/HUMINT). The Defense Intelligence Agency is responsible for Defense-wide counterintelligence, a capability and mission it subsumed when the Counterintelligence Field Activity (CIFA) was integrated within it. Domestic counter-intelligence is principally under Federal Bureau of Investigation (FBI), a law enforcement service. The FBI and CIA jointly operate the National Counter terrorism Center, although the CIA is not allowed to do field operations within the US. The lead agency