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.
Air Combat Command
Historically, Combat Command was an earlier air unit designation. During 1941 and early 1942, the tactical air units of the War Department, formerly known as the GHQ Air Force, formed the Air Force Combat Command. The AFCC was dissolved in the reorganization of the United States Army, effective 9 March 1942, which created the United States Army Air Forces as a major command of the Army, which functioned as a "de facto" independent service branch of the Armed Forces.