Answer by taking a quote from the following article:

Paul Warfield Tibbets Jr. was born in Quincy, Illinois, on 23 February 1915, the son of Paul Warfield Tibbets Sr. and his wife, Enola Gay Tibbets. When he was five years old the family moved to Davenport, Iowa, and then to Iowa's capital, Des Moines, where he was raised, and where his father became a confections wholesaler. When he was eight, his family moved to Hialeah, Florida, to escape from harsh midwestern winters. As a boy he was very interested in flying.

Because he went to a military school, attended some college, and had some flight experience, Tibbets qualified for the Aviation Cadet Training Program. On 25 February 1937, he enlisted in the army at Fort Thomas, Kentucky, and was sent to Randolph Field in San Antonio, Texas, for primary and basic flight instruction. During his training, he showed himself to be an above-average pilot. He was commissioned as a second lieutenant and received his pilot rating in 1938 at Kelly Field in San Antonio.  After graduation, Tibbets was assigned to the 16th Observation Squadron, which was based at Lawson Field, Georgia, with a flight supporting the Infantry School at nearby Fort Benning. It was at Fort Benning that Tibbets met Lucy Frances Wingate, then a clerk at a department store in Columbus, Georgia. The two quietly married in a Roman Catholic seminary in Holy Trinity, Alabama on June 19, 1938. Tibbets did not inform his family or his commanding officer, and the couple arranged for the notice to be kept out of the local newspaper. They had two sons. Paul III was born in 1940, in Columbus, Georgia, and graduated from Huntingdon College and Auburn University. He was a colonel in the United States Army Reserves and worked as a hospital pharmacist. He died in West Monroe, Louisiana, in 2016. The younger son, Gene Wingate Tibbets, was born in 1944, and was at the time of his death in 2012 residing in Georgiana in Butler County in southern Alabama.  While Tibbets was stationed at Fort Benning, he was promoted to first lieutenant and served as a personal pilot for Brigadier General George S. Patton, Jr., in 1940 and 1941. In June 1941, Tibbets transferred to the 9th Bombardment Squadron of the 3d Bombardment Group at Hunter Field, Savannah, Georgia, as the engineering officer, and flew the A-20 Havoc. While there he was promoted to captain. In December 1941, he received orders to join the 29th Bombardment Group at MacDill Field, Florida, for training on the Boeing B-17 Flying Fortress. On 7 December 1941, Tibbets heard about the Japanese attack on Pearl Harbor while listening to the radio during a routine flight. Due to fears that German U-Boats might enter Tampa Bay and bombard MacDill Field, the 29th Bombardment Group moved to Savannah. Tibbets remained on temporary duty with the 3d Bombardment Group, forming an anti-submarine patrol at Pope Army Airfield, North Carolina, with 21 B-18 Bolo medium bombers. The B-18s were used as an intermediate trainer, which pilots flew after basic flight training in a Cessna UC-78 and before qualifying in the B-17.

How did he like this program?
On 25 February 1937, he enlisted in the army at Fort Thomas, Kentucky, and was sent to Randolph Field in San Antonio, Texas, for primary and basic flight instruction.