At the end of World War I, Old Sarum was one of the few airfields which were not closed as part of the post war run-down. In 1920, 11 Training Squadron was disbanded and preparations were made to turn the station into the permanent home of the School of Army Co-operation. The School was transferred to Old Sarum from Stonehenge in January 1921 and for many years ran mixed courses for Army and Air Force personnel. Its prime task was the development of efficient air/ground communication under operational conditions, principally between Army officers, including those of the newly formed armoured forces, and the pilots and observers of the RAF Army Cooperation Squadrons.