Washington National Airport and the 1952 Radar Anomalies
Over two weekends in July 1952, radar operators at Washington National Airport tracked unexplained targets over the capital, and Air Force interceptors were scrambled — prompting the largest Air Force press conference since the Second World War.
On the weekends of 19–20 and 26–27 July 1952, radar operators at Washington National Airport — and, corroborating, at Andrews Air Force Base — repeatedly picked up unidentified targets over the restricted airspace of the United States capital. Visual sightings of moving lights accompanied the radar returns on the second weekend, and the Air Force scrambled F-94 jet interceptors to investigate. The national press named it the "Washington Merry-Go-Round," and the Air Force held its largest public press briefing since the Second World War to address it.
The radar picture
Beginning around midnight on 19 July, controllers at the Civil Aeronautics Authority's air route traffic control center in Washington began seeing solid, drifting targets appearing and vanishing across their scopes. The returns were not isolated to one radar set; Andrews Air Force Base operators confirmed similar returns, and the objects appeared to accelerate, stop, and reverse direction at speeds far beyond any aircraft of the time.
The interceptors
On the night of 26–27 July, with the targets appearing again, Air Defense Command scrambled F-94 Starfire interceptors. By the time the fighters reached Washington airspace, the targets had disappeared; when the jets returned to base, the targets reappeared on the scopes. One pilot reported a brief visual contact with a light that accelerated away.
The official explanation
At the press conference, Air Force Major General Roger Ramey attributed the radar returns to a temperature inversion — a layer of warm air that traps radar beams near the ground and causes stationary ground returns to appear to move. Temperature inversions are genuinely common over the humid Potomac basin in summer, and they can produce false radar returns. The explanation is credible for the radar returns. What it does not address is the simultaneous visual sightings — by airline crews, military pilots, and civilians on the ground — of lights moving in the same place and time as the returns.
Why it mattered at the time
The Washington episode forced the United States Air Force to treat the subject as a matter of operational concern rather than public curiosity. The previous project, Grudge, had all but dismissed reporting; within months the effort was reactivated as Project Blue Book under Captain Edward Ruppelt, and the following January the CIA convened the Robertson Panel — the highest-level U.S. government review of the subject until the 2020s.
What the record contains
Many of the primary documents — radar film, controller logs, the aircrew interviews — survive in declassified Air Force files released with Project Blue Book's. The Washington case remains one of the best-documented multi-sensor events in the public record: a sustained radar pattern corroborated across independent sets, observed visually by multiple witnesses, with a conventional explanation that covers only part of what was reported.
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