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In July 1952, the United States was already living under intense pressure. The Korean War was continuing. The Cold War was deepening. The Soviet Union possessed atomic weapons. And Americans had become accustomed to the possibility that a crisis could develop with very little warning. Then something unusual began appearing on radar over Washington, D.C. On the night of July 19, radar operators at Washington National Airport reported unexplained returns. The objects appeared to move through the area around the nation's capital. The reports were significant because they were not based solely on the observations of one person. Radar operators saw unusual returns. Air traffic controllers became involved. And military aircraft were eventually sent to investigate. The incident immediately attracted attention. Washington was not an ordinary location. This was the capital of the United States. The White House was there. The Capitol was there. The headquarters of government was there. If unidentified objects were operating in the area, the implications were potentially serious. The reports described objects moving in unusual ways. Some appeared to move slowly. Others seemed to change position rapidly. The difficulty was determining exactly what the radar operators were seeing. Radar does not provide a perfect picture of the world. Atmospheric conditions can affect radar signals. Temperature inversions can cause radar beams to behave differently from normal and can produce anomalous returns. This possibility became central to the official explanation. But the radar observations were only part of the story. There were also visual reports. People in the area reported seeing unusual lights. Air traffic controllers reported strange activity. Military personnel were alerted. The Air Force scrambled interceptor aircraft to investigate. The pilots were unable to establish a clear identification of the objects. The incident became even more dramatic when reports suggested that the objects appeared to disappear or move away as aircraft approached. Such reports were naturally alarming. But it is important to separate what was observed from what was later inferred. An object disappearing from a radar screen does not necessarily mean that it accelerated to extraordinary speed. It may have moved outside the radar's effective coverage. It may have been affected by atmospheric conditions. The data available at the time did not always provide enough information to determine exactly what happened. Nevertheless, the events of July 1952 became one of the defining moments in UFO history. The sightings were repeated the following weekend. On July 26, additional reports were received. Again, radar operators reported unexplained returns. Again, visual observations were made. Again, military aircraft were sent to investigate. The situation had now become too significant to ignore. The national media took notice. Newspapers reported the mysterious activity over the capital. The public wanted answers. The military needed to reassure the country. And officials had to balance the UFO reports against the realities of the Cold War. If the objects were Soviet aircraft, the situation represented a serious national-security problem. If they were something else, the military needed to determine what that something was. If they were atmospheric or radar phenomena, officials needed to explain why experienced personnel had interpreted them differently. The Air Force therefore faced a difficult public-relations challenge. Major General John Samford, the Air Force Director of Intelligence, held a major press conference on July 29. The Air Force emphasized the possibility that temperature inversions could explain at least some of the radar observations. This was not an absurd scientific explanation. Temperature inversions are real. They can affect radar propagation and can create unusual or misleading radar returns under certain conditions. But explaining a complicated series of observations is different from proving