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 Shield
In 1947, the United States Air Force separated from the Army, and the proud tradition of the Security Forces began. At first, the Security Forces were still called the Military police, and still wore the old Army arm band, or brassard. Soon the Military Police were renamed the Air Police, but they continued to wear the arm band. During this change the brassard was redesigned to show the words Air Police in yellow on a background of Air Force blue. Further editions of the brassard showed the same Air Police in dull gray on a background of dark blue.