The Flying / Aviation Cadet Pilot Training Program was originally created by the U.S. Army to train its pilots. Originally created in 1907 by the U.S. Army Signal Corps, it expanded as the Army's air assets increased. Candidates originally had to be between the ages of 19 and 25, athletic, and honest. Two years of college or three years of a scientific or technical education were required. Cadets were supposed to be unmarried and pledged not to marry during training. From 1907 to 1920, pilot officers were considered part of the Signal Corps or the Signal Officer Reserve Corps. After 1920, they were considered part of their own separate organization, the U.S. Army Air Service (1918–1926).