During 1959, Cross City AFS joined the Semi Automatic Ground Environment (SAGE) system, feeding data to Direction Center DC-09 at Gunter AFB, Alabama. After joining, the squadron was re-designated as the 691st Radar Squadron (SAGE) on 1 October 1959.Id. The radar squadron provided information 24/7/365 to the SAGE Direction Center where it was analyzed to determine range, direction altitude speed and whether or not aircraft were friendly or hostile.
