This United States Army publication, establishes policies on criminal investigation activities, including the utilization, control, and investigative responsibilities of all personnel assigned to the U.S. Army Criminal Investigation Command elements. It also delineates responsibility and authority between Military Police and the U.S. Army Criminal Investigation Command. This regulation applies to the Regular Army, the Army National Guard/Army National Guard of the United States, and the U.S. Army Reserve, unless otherwise stated. It also applies to the Army National Guard when in active Federal service, as prescribed in Section 802, Title 10, United States Code. This regulation prescribes policies and procedures pertaining to criminal investigation activities within the Department of the Army (DA). It prescribes the authority for conducting criminal investigations, crime prevention surveys, protective service missions, force protection and antiterrorism efforts and the collection, retention, and dissemination of criminal information. It delineates responsibility and authority between installation law enforcement (LE) activities and the U.S. Army Criminal Investigation Command (USACIDC).