United States Army Counterintelligence (ACI) is the component of United States Army Military Intelligence which conducts counterintelligence activities to detect, identify, assess, counter, exploit and/or neutralize adversarial, foreign intelligence services, international terrorist organizations, and insider threats to the United States Army and U.S. Department of Defense (DoD).
Overview
ACI is one of only three DoD Counterintelligence (CI) entities designated by the Office of the Under Secretary of Defense for Intelligence and Security, as a "Military Department CI Organization" or "MDCO." The other two DoD MDCO's are the Department of the Air Force Office of Special Investigations (OSI) and the Naval Criminal Investigative Service (NCIS). As an MDCO, Special Agents of ACI are recognized federal law enforcement officers tasked with conducting criminal CI investigations in conjunction with other CI activities. Other CI entities within the DoD not recognized as MDCOs, such as Marine Corps Counterintelligence and the Defense Counterintelligence and Security Agency (DCSA) have no direct criminal investigative mission and therefore are designated only as "intelligence" or "security" organizations; although they may assist in such investigations in a non-law enforcement capacity as authorized by Executive Order 12333 and applicable regulations.
ACI Special Agents are U.S. Army personnel, either military or civilian, who are trained and appointed to conduct CI investigations and operations for the U.S. Army and DoD. As federal law enforcement officers who are issued badge and credentials, they have apprehension authority and jurisdiction in the investigation of national security crimes committed by Army personnel including treason, spying, espionage, sedition, subversion, sabotage or assassination directed by foreign governments/actors, and support to international terrorism. They do not have jurisdiction over general criminal matters, which are investigated by the United States Army Criminal Investigation Command (CID). In other branches of the U.S. military, both general criminal and counterintelligence investigations are performed by the same entity, as seen with AFOSI and NCIS who are also identified as "Defense Criminal Investigative Organizations." The Army continues to keep these investigative activities separate via ACI and CID, although parallel and joint investigations happen periodically between these two U.S. Army agencies.
Most operational ACI Special Agents today work under the auspices of the United States Army Intelligence and Security Command (INSCOM) with the US Army Counterintelligence Command (USACIC) responsible for CI activities and operating field offices within the continental United States. Outside the continental U.S., the 500th Military Intelligence Brigade provides the same type of support in Hawaii and Japan, the 501st Military Intelligence Brigade supports South Korea, and the 66th Military Intelligence Brigade does so in Europe. The 470th Military Intelligence Brigade covers South America, the 513th Military Intelligence Brigade covers the greater Middle East, and the 650th Military Intelligence Group covers NATO missions in applicable countries. Other U.S. Army elements also have CI agents assigned to provide direct support such as those found within the various elements of Special Operations.
History
Prior to World War I, the U.S. military had no standing counterintelligence services, requiring the use of other elements to conduct counterintelligence activities, such as the Culper Spy Ring during the American Revolution, and by Allan Pinkerton and his private detectives during the U.S. Civil War.
ACI was formed as a standing CI service in 1917 during World War I, as the Corps of Intelligence Police under the newly created Military Intelligence Division commanded by Colonel Ralph Van Deman. Later, it was renamed and reformed as the Counter Intelligence Corps (CIC) during World War II and the Cold War. In the early 1970's, following the disbanding of the CIC, ACI was completely restructured as a result of intelligence reform. ACI agents were placed under the control of different military intelligence organizations that followed into the present day under INSCOM.