From July 12 to 29, 1952, many people in Washington, D.C., reported seeing unidentified flying objects (UFOs). This event later became known as the Washington flap, the Washington National Airport Sightings, or the Invasion of Washington. The most well-known sightings happened during two consecutive weekends: July 18–19 and July 26–27. UFO historian Curtis Peebles called this incident "the climax of the 1952 (UFO) flap," saying that "Never before or after did Project Blue Book and the Air Force experience such a huge number of (UFO) reports." This event became one of the most famous UFO sightings in history.
1952 UFO flap
The 1952 UFO flap was a time when many people reported seeing unidentified flying objects, and the media paid a lot of attention to these sightings during the summer of 1952. This event ended with reports of objects seen over Washington, D.C. In the four years before 1952, the U.S. Air Force recorded 615 UFO reports. During the 1952 flap, they received more than 717 new reports. Edward J. Ruppelt, who led Project Blue Book, later said: "In six months of 1952, 148 major newspapers published over 16,000 articles about flying saucers."
On April 3, the Associated Press reported that Life magazine would soon publish a story about the Air Force's serious interest in flying saucers. The June issue of Look magazine included an article by astrophysicist Donald Howard Menzel, who suggested that flying saucers might be optical mirages caused by temperature changes in the air. American newspapers also covered similar ideas from French astronomer Ernest Esclangon, who argued that flying saucer reports could not be from supersonic vehicles because no sonic booms were reported.
On April 7, Life magazine, which had Marilyn Monroe on its cover, published an article titled "Have We Visitors From Space?" This piece became the most trusted source to seriously consider that flying saucer sightings might be from spaceships beyond Earth. The attention this article received is believed to have led to more reports of UFOs that summer.
Sightings over Washington, D.C.
During a time when many UFO sightings were reported, two consecutive Saturday nights in July 1952 saw UFOs observed near Washington D.C. On Saturday, July 19, at 11:40 p.m., Edward Nugent, an air traffic controller at Washington National Airport, saw seven objects on his radar. These objects were 15 miles south-southwest of the city, and no known planes were in the area. The objects did not follow normal flight paths. His supervisor, Harry Barnes, watched the radar screen and later said the objects moved in ways that were very different from regular airplanes.
Barnes had two other controllers check the radar. They confirmed the radar was working properly. Barnes then contacted the control tower at Washington National Airport. The controllers there, Howard Cocklin and Joe Zacko, saw unknown blips on their radar and saw a bright light in the sky that moved very quickly. Cocklin asked Zacko, "Did you see that? What the hell was that?"
At this time, other objects appeared on the radar screen. When they moved over the White House and the U.S. Capitol, Barnes called Andrews Air Force Base, which is 10 miles from the airport. Although Andrews said they saw no unusual objects on their radar, an airman soon reported seeing a strange object. Airman William Brady, who was in the tower, saw an object that looked like an orange ball of fire with a tail. Brady said it was unlike anything he had ever seen. As Brady tried to warn others, the object disappeared quickly.
At the same time, S. C. Pierman, a pilot for Capital Airlines, was waiting on the runway for takeoff instructions. He saw what he thought was a meteor, but then he was told the radar detected unknown objects near his plane. Pierman saw six white, tailless lights moving quickly for 14 minutes. He stayed in radio contact with Barnes, who later said the sightings matched what they saw on the radar. When Pierman reported the lights moving fast, the objects disappeared from the radar.
Meanwhile, at Andrews Air Force Base, some radar operators thought the objects might be stars or meteors. However, Staff Sgt. Charles Davenport saw an orange-red light that stopped suddenly, then changed direction and altitude several times. At one point, radar systems at both National Airport and Andrews Air Force Base tracked an object hovering over a radio beacon. The object disappeared from all three radar systems at the same time.
At 3 a.m., two U.S. Air Force F-94 Starfire jet fighters from New Castle Air Force Base in Delaware arrived over Washington. At that time, the UFOs vanished from the radar. However, when the jets left due to low fuel, the UFOs reappeared. This made Barnes believe the UFOs were monitoring radio traffic. The UFOs were last seen on radar at 5:30 a.m.
The sightings on July 19–20, 1952, were reported in newspapers across the country. One headline read "SAUCERS SWARM OVER CAPITAL." At the time, USAF Captain Edward J. Ruppelt, who led the Air Force's Project Blue Book investigation into UFOs, was in Washington. He learned about the sightings from newspaper headlines on Monday, July 21. After talking with Pentagon officials, Ruppelt tried to get a staff car to investigate but was denied. He was told he could rent a taxi instead. Frustrated, he left Washington and returned to his office at Wright-Patterson Air Force Base in Ohio. There, he spoke with a radar specialist, Captain Roy James, who thought unusual weather might explain the radar targets. On July 24, two Air Force colonels flying to Colorado Springs reported seeing triangular-shaped objects.
On Saturday, July 26, at 8:15 p.m., a pilot and stewardess on a National Airlines flight saw lights above their plane. Soon after, radar systems at Washington National Airport and Andrews Air Force Base tracked more unknown objects. USAF master sergeant Charles E. Cummings saw the objects from Andrews and said they did not look like shooting stars. They moved faster than any he had ever seen.
Albert M. Chop, the press representative for Project Blue Book, arrived at Washington National Airport and refused reporters’ requests to photograph the radar screens due to security concerns. By 9:30 p.m., the radar center detected unknown objects in every direction. Some objects moved slowly, while others changed direction and traveled at speeds up to 7,000 mph. At 11:30 p.m., two F-94 Starfire jet fighters from New Castle Air Force Base arrived over Washington. The pilot leading the jets, Captain John McHugo, was directed toward the radar blips but saw nothing. His wingman, Lieutenant William Patterson, saw four white lights and chased them. He said he tried to reach the objects but could not catch up. When asked what he saw, Patterson said, "I see them now and they're all around me. What should I do?" No one answered because they did not know what to tell him.
After midnight on July 27, USAF Major Dewey Fournet, a Project Blue Book liaison at the Pentagon, and Lt. John Holcomb, a Navy radar specialist, arrived at the radar center. Holcomb spoke with the Washington National Weather Station, which said a slight temperature inversion was present over the city. However, Holcomb believed the inversion was not strong enough to explain the radar signals. Fournet said everyone in the radar room believed the objects were likely solid metal. Weather-related radar signals had been seen before, but the controllers were not paying attention to them. Two more F-94s were sent from New Castle Air Force Base. One pilot saw nothing unusual, while the other saw a white light that disappeared when he approached it. Civilian pilots also reported glowing objects that matched radar blips seen by Andrews Air Force Base. The sightings and radar returns ended at sunrise, just as they had on July 20.
Air Force explanation
On July 29, 1952, Air Force Major Generals John Samford, Director of Intelligence, and Roger M. Ramey, Director of Operations, held a press conference at the Pentagon. Many reporters attended the event, which was the largest Pentagon press conference since World War II. Samford explained that the Air Force had studied hundreds of UFO reports over the years. He said some of these reports came from trustworthy people who saw unusual things, but none of them threatened national security. He noted that the visual sightings over Washington could be stars or meteors, and radar detections might be caused by temperature inversion, a weather condition where warm air traps heat near the ground. Samford added that the radar contacts were not from solid objects and therefore posed no danger. When asked about similar radar contacts before the Washington incident, Samford said the Air Force had recorded hundreds of such events, but none resulted in confirmed UFO sightings.
A B-25 bomber crew flying over Washington during the sightings reported that radar at National Airport detected unknown targets, but the crew saw nothing unusual. One crew member later said the radar had picked up a steamboat on the Wilson Lines trip to Mount Vernon. Air Force Captain Harold May, who was at Andrews AFB during the sightings, saw a light that changed colors and appeared to move erratically. He later concluded it was a star distorted by the atmosphere. On July 27, an Eastern Airlines flight was told an object was nearby, but the crew saw nothing. When the plane turned sharply to look, the object "disappeared" according to radar operators.
The Air Force requested an analysis of the radar sightings by the CAA’s Technical Development and Evaluation Center. Their report found temperature inversion was likely responsible for most radar and visual sightings. Project Blue Book later classified the Washington radar blips as false images caused by temperature inversion and the visual sightings as misidentified stars, meteors, or city lights. Later, scientists Donald Menzel and Philip Klass supported the temperature inversion explanation. Klass noted that 1952 radar technology could not distinguish ordinary objects like birds or weather balloons from unknown targets.
In his 1965 book Anatomy of a Phenomenon, UFO researcher Jacques Vallée described the 1952 Washington incident as a poorly documented case. In The Report on Unidentified Flying Objects, Edward J. Ruppelt wrote that some radar operators, control tower personnel, and Air Force officers disagreed with the Air Force’s explanation. Michael Wertheimer, a researcher for the Condon Report, also noted that radar witnesses still disputed the Air Force’s findings. In 2002, former radar controller Howard Cocklin told the Washington Post he still believed he saw an object, stating he saw it on the radar screen and out the window at Washington National Airport.
White House concern and CIA interest
The sightings on July 26–27 were reported in major newspapers and caused President Harry Truman to ask his military aide to contact Ruppelt for an explanation of the sightings and unusual radar signals. Truman listened to the conversation between the aide and Ruppelt on a separate phone line but did not ask any questions. Ruppelt, recalling his earlier discussion with Captain James, told the president’s aide that the sightings might have been caused by a temperature inversion, a weather condition where a layer of warm, moist air sits above a layer of cool, dry air near the ground. This can cause radar signals to bend, creating false readings. However, Ruppelt had not yet spoken to any witnesses or officially investigated the events.
CIA historian Gerald Haines, in his 1997 account of the CIA’s work with UFOs, noted Truman’s concern. He wrote that a large number of UFO sightings in the United States in 1952, especially in July, worried the Truman administration. On July 19 and 20, radar screens at Washington National Airport and Andrews Air Force Base detected mysterious signals. These signals appeared again on July 27. In response, the CIA created a special study group within the Office of Scientific Intelligence (OSI) and the Office of Current Intelligence (OCI) to examine the situation. Edward Tauss, who worked on the group, reported that most UFO sightings had simple explanations. However, he recommended that the CIA continue monitoring the issue. This concern led to the formation of the Robertson Panel in January 1953.
The Robertson Panel
In 1952, the large number of UFO reports worried the United States Air Force and the Central Intelligence Agency (CIA). Both groups were concerned that an enemy country might spread false UFO reports to cause widespread fear and allow a surprise attack. On September 24, 1952, the CIA's Office of Scientific Intelligence (OSI) sent a letter to Walter B. Smith, the CIA's Director. The letter explained that the UFO situation had important effects on national security because public interest in UFOs could lead to panic. This letter led to the formation of the Robertson Panel in January 1953. Howard P. Robertson, a physicist, led the panel, which included other respected scientists. The group spent four days reviewing the most important UFO cases collected by Project Blue Book. The panel concluded that most UFO cases were not unusual or a threat to national security. The panel suggested that the Air Force and Project Blue Book should focus less on studying UFO reports and more on publicly explaining them. They advised that the Air Force and Project Blue Book should take steps to remove the special attention and mystery that had been given to UFOs. After the panel's advice, Project Blue Book rarely shared information about UFO cases it had not labeled as "solved." Cases that remained unsolved were rarely discussed by the Air Force.