1910 – General Carroll was born in Chicago, Illinois on the 19th of March.
1933 – He was graduated from St. Mary of the Lake Seminary, Mundelein, Illinois with a bachelor of arts degree.
1940 – He earned a J.D. degree from Loyola University, Chicago, Illinois.
– He was a member of the Illinois State Bar Association.
– General Carroll joined the FBI in October, where he served as a special agent in field offices at Memphis and Knoxville, Tennessee, before assignment to the Chicago, Illinois field office.
– He was instrumental in catching noted gangster Roger "Tough" Touhy, which brought him to the personal attention of FBI Director J. Edgar Hoover.
1944 – In May, he was transferred to the Washington headquarters of the FBI, where he held progressive positions as supervisor in charge of bank robbery and kidnapping matters, chief of the Criminal Section, and first assistant to the assistant director of the FBI in charge of the General Investigations and Accounting Division.
1947 – In May, he was recalled to his former position in the FBI as an administrative assistant to the director of the FBI.
– When the U.S. Air Force was established as a separate executive department on the 18th of September by the National Security Act, the secretary of the Air Force, Stuart Symington, requested FBI Director J. Edgar Hoover to loan General Carroll to the services to organize an Air Force agency for investigative and counterintelligence functions.
1948 – He organized and directed this new organization, the Office of Special Investigations along the lines of the FBI rather than the U.S. Army’s Criminal Investigation Division (CID). General Carroll was tendered a commission as a colonel, U.S. Air Force Reserve on the 12th of January.
– He was ordered to active duty in the grade of brigadier general May 6, and promoted to major general August 11, 1950.
– On the 6th of May, General Carroll served as the first director of the Office of Special Investigations, creating and organizing this centrally-directed investigative service, establishing district offices to service the air commands in the United States, and furnishing trained specialists to Air Force activities worldwide for the conduct of special investigations.
– On the 6th of September, he was appointed deputy Inspector General for security, U.S. Air Force, In this assignment he was responsible for the security and physical protection of Air Force installations and activities against sabotage, espionage, and other hostile threats.
1952 – General Carroll had been a member of the U.S. Air Force Reserve on active duty.
– On the 29th of January, he was granted a commission into the Regular Air Force as a permanent colonel by a special act of Congress.
1958 – General Carroll was then assigned to Wiesbaden, Germany on the 1st of April, as Deputy Commander (Rear) for the U.S. Air Forces in Europe (USAFE).
1959 – He served in that capacity until November when, under a command reorganization, he was named Chief of Staff, USAFE.
1960 – On the 1st of February, General Carroll was promoted to lieutenant general and became The Inspector General of the U.S. Air Force stationed at Headquarters, U.S. Air Force in Washington, D.C.
1969 – He retired on the 15th of September.
1991 – He died on the 20th of January due to complications related to Alzheimer’s Disease.