DIA (Defense Intelligence Agency)

Founding

According to the DIA, Lieutenant General Joseph F. Carroll, acting on the orders of Secretary of Defense Robert McNamara, set up the agency on 1 October 1961 with a small staff in borrowed offices. The DIA calls this the most important organisational change in US military intelligence since the Second World War.¹

Carroll built up the agency’s internal structure and defended its role against opposition from the individual armed services.¹

The basis was Department of Defense Directive 5105.21, which established the DIA on 1 August 1961 under the National Security Act of 1947. Deputy Secretary of Defense Roswell Gilpatric wrote to President Kennedy on 21 August 1961 that the agency would be activated on 1 October and would probably reach full capability only after at least two years, as it would take over its tasks gradually.²

According to the DIA History Office, the agency started with 25 people in borrowed space in the Pentagon. It was created following the 1960 report of the Joint Study Group on Foreign Intelligence Activities and McNamara’s drive to unify intelligence within the Department of Defense. The chain of command ran from the Secretary of Defense through the Joint Chiefs of Staff to the Director of the DIA; its charter began with 19 functions.³

The Cuban Missile Crisis

According to the DIA, in September 1962 the agency’s analysts suspected that the USSR had deployed nuclear-capable missiles in Cuba. On 4 October 1962 Carroll set up a round-the-clock Cuban Situation Room and pressed for U-2 flights over western Cuba; film from the 14 October mission showed the missiles. On 16 October Carroll and the analyst John Hughes presented the photographs to McNamara.⁴

Development

On 12 December 1964 a directive of the Secretary of Defense created the Defense Attaché System – a single, DIA-managed system of military attachés, fully operational from July 1965; since 2014 it has been called the Defense Attaché Service.⁵

The Goldwater–Nichols Act of 1986 gave the DIA the status of a combat support agency. The agency was based at Arlington Hall Station and, from 1984, at the Defense Intelligence Analysis Center at Bolling; its other sites include the Missile and Space Intelligence Center in Huntsville.⁶

Mission and leadership today

The DIA provides intelligence on foreign armed forces to warfighters, policymakers and defence planners. Its director is a three-star officer, rotating among the armed services roughly every three years, and is the principal adviser to the Secretary of Defense and the Chairman of the Joint Chiefs of Staff on military intelligence; according to the DIA website, the post is held by Lieutenant General Jeffrey A. Kruse (as of 4 November 2026).⁶

The DIA is one of the 18 elements of the intelligence community coordinated by the ODNI.⁷