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 in the United Kingdom
The origins of the United States Air Force in the UK can be traced to a series of agreements made between 27 January and 27 March 1941 which provided for American naval, ground and air support for campaigns against Nazi Germany. As a result, a special U.S. Army Observer Group was activated in London on 19 May 1941. One of the first tasks of that unit was to reconnoitre areas regarded as potential sites for United States Army Air Forces (USAAF) installations.