The National Security Archive, from sources at US national security agencies, principal of which were the US Central Intelligence Agency; the Director of Central Intelligence; the US Defense Intelligence Agency, the armed forces ntelligence organisation;

From 1945 to 1991, the Soviet Union represented the primary target for the United States intelligence community. Recruiting agents in the Soviet bloc was the primary task of the Central Intelligence Agency's Directorate of Operations. Meanwhile, the Central Intelligence Agency (CIA) and other technical collection agencies devised and deployed ground stations, aircraft, and satellites with the principal purpose of collecting intelligence to guide US decision makers in dealing with the Soviet Union and to assist the US military prepare for a possible war. Much of the product of those activities was reflected in the huge number of analytical documents produced by the CIA and other intelligence production units over the course of the Cold War. The key production organisations included the CIA (and its predecessor the Central Intelligence Group), the US State Department's Bureau of Intelligence and Research, the Defense Intelligence Agency (from 1961), and the analytical units of the armed services. The collective focus of the US intelligence community on the Soviet Union was in five areas: foreign policy, military forces and policy, the economy, science and technology, and the domestic situation. Intelligence production in these areas came in a variety of forms. The best known were National Intelligence Estimates (NIEs) and Special National Intelligence Estimates (SNIEs). NIEs were regularly scheduled products that covered a number of subjects, the majority of which concerned military matters. SNIEs were commissioned in reaction to specific events or the emergence of specific concerns. As with the NIEs they were co-ordinated among the representatives of the intelligence agencies who served on the Intelligence Advisory Committee (until 1958), the United States Intelligence Board (until 1976), and the National Foreign Intelligence Board. NIEs and SNIEs attempted to estimate how events would develop. Other products, including Interagency Intelligence Memoranda (IIM) have also contributed intelligence based on highly technical matters. In addition to the production of national intelligence documents, each of the intelligence organisations produced studies which were not co- ordinated with other agencies. Thus, the Central Intelligence Group (1946-1948) and then the CIA produced an immense number of intelligence assessments and reports within various offices of the CIA's Directorate of Intelligence. Similarly, the Defense Intelligence Agency produced thousands of studies concerning Soviet matters, including studies of military doctrine, nuclear targeting policy, specific weapons, command, control and communications, and force deployment. Meanwhile, US State Department reports primarily included Soviet foreign policy and economic matters. At the armed service level, Soviet-related intelligence studies focused both on general military developments as well as technical studies of Soviet weapons systems. The former studies were conducted by organisations including the Office of Naval Intelligence, the Army Intelligence and Threat Analysis Center, and the Air Force Intelligence Agency. Organisations including the Naval Intelligence Support Center and the Air Force Technology Division concentrated on issues of design, operation and capabilities of tanks, submarines, and aerospace vehicles.