Joseph Carroll (DIA)
When the U.S. Air Force was established as a separate executive department under the National Security Act of 1947, Secretary of the Air Force W. Stuart Symington, requested FBI Director J. Edgar Hoover to loan General Carroll to the services to organize a U.S. Air Force agency for investigative and counterintelligence functions. He organized and directed this new organization, the AFOSI, along the lines of the FBI rather than the U.S. Army's Criminal Investigation Command (USACIDC or CID). General Carroll was tendered a commission as a colonel, U.S. Air Force Reserve, January 12, 1948. He was ordered to active duty in the grade of brigadier general May 6, 1948, and promoted to major general August 11, 1950.
United States Air Force Security Forces
On 1 September 1950 the Air Police School was established at Tyndall Air Force Base. In 1952 the Air Police school was transferred to Parks AFB, California, and re-designated the "Air Base Defense School" to emphasize on air base defense capabilities. It soon became evident the emphasis on air base defense was not making much headway. On 13 October 1956 Air Police training was transferred to Lackland AFB, Texas, where it evolved into Security Police training and eventually became the US Air Force Security Forces Academy.