Three radar operators man a Ground-Control-Intercept console inside an Air National Guard radar operations shelter during the Cold War. The center controller, wearing a headset, tracks aircraft on the large circular Plan Position Indicator scope while colleagues monitor supporting displays. Sites like this formed the backbone of America's continental air defense network, with Air National Guard squadrons standing around-the-clock watch to detect and direct interceptors against potential Soviet bomber incursions throughout the 1950s and 1960s. Project: 218659