During the 1930s, many Army Air Corps leaders began to experiment with strategic air operations. Like Billy Mitchell before them, they advocated using air power independently of the Army ground forces to destroy enemy targets behind the lines of combat. This Air Corps emphasis on strategic operations disturbed some ground forces leaders, who believed their aerial support needs were being neglected. Aerial support was particularly vital for artillery fire adjustment. Partly because Air Corps fire support aircraft were not always available, the chief of field artillery and other artillery officers became interested in using light aircraft organic to the artillery units. The Army experimented with using small organic aircraft for artillery fire adjustment and other functions in maneuvers at Camp Beauregard, La., in August 1940. The tests were repeated on a larger scale in the Army maneuvers in Louisiana, Tennessee, Texas, and the Carolinas in 1941.