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Project Blue Book

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In June 1947, while flying his small plane, businessman and civilian pilot Kenneth Arnold reported seeing nine objects moving at high speeds through the skies over Washington’s Mount Rainier. Widely publicized reports of Arnold’s experience, followed by an increasing number of reported UFO sightings, led the U.S. Air Force to begin an investigation into the sightings, called Operation Sign, in 1948. 

The initial investigation resulted in the formation of Project Blue Book in 1952; that project became the longest running of the U.S. government’s official inquiries into UFO sightings, compiling reports on more than 12,000 sightings or related events from 1952 to its dismantling in 1969.

Early Sightings

Though reports of mysterious flying objects–often attributed to spirits, angels, phantoms, ghosts or other supernatural phenomena–have existed for centuries, World War II and the accompanying development of rocket science marked a new level of interest in what would officially become known as unidentified flying objects (UFOs). The first well-known UFO sighting occurred in June 1947, when civilian pilot and businessman Kenneth Arnold reported seeing nine objects, glowing bright blue-white, flying in a “V” formation at speeds of up to 1,700 mph in the skies over Washington’s Mount Rainier.

Did you know? Kenneth Arnold compared the movement of the nine mysterious objects over Mount Rainier to that of “a saucer if you skip it across water.” This statement later led to the misconception that the objects were shaped like saucers, and to the widespread use of “flying saucer” as a synonym for UFO.

After news of Arnold’s experience hit the media, a rash of similar sightings were reported across the United States, including a highly controversial report of what appeared to be a crashed UFO near a U.S. Army base in Roswell, New Mexico. (The Army claimed the object in question was the wreckage of a weather balloon, claims that conspiracy-minded “ufologists” would later dispute.) In response to the increasing number of UFO-related reports, the U.S. Air Force launched Operation Sign in 1948. Among the initial theories of the project’s participants was that some UFOs were actually Soviet aircraft (this was the Cold War era, after all), although they also posed the hypothesis that some might be extraterrestrial spacecraft.

Formation of Project Blue Book & the Robertson Panel

The Air Force’s UFO-related inquiries took place against a backdrop of frenzied popular interest in the strange flying objects, which reached its peak soon after Project Blue Book began in 1951. Headquartered at Wright-Patterson Air Force Base in Ohio, Project Blue Book would become the longest running of the U.S. government’s official inquiries into UFOs. Alarmed by the striking number of UFO sightings reported in 1952, the administration of President Harry S. Truman feared an outbreak of hysteria over the issue. In 1953, the Central Intelligence Agency (CIA) responded to these fears by assembling an expert panel of scientists, headed by physicist H.P. Robertson of the California Institute of Technology, to discuss the UFO issue.

The Robertson Panel met for three days, during which they interviewed military officers and Blue Book officials and reviewed photos and film of supposed UFOs. The panel concluded that there was no basis for the so-called extraterrestrial hypothesis, and that UFOs posed no security threat. Fully 90 percent of the sightings, according to the Robertson Panel, could be attributed to astrological or meteorological activity, or to man-made causes such as balloons or searchlights. The panel’s findings were not fully declassified until 1979, feeding suspicions that a government conspiracy was in the works.

The Condon Report

Over the next 17 years, Project Blue Book would compile reports of 12,618 UFO sightings or related events. Similarly to the Robertson Panel, Blue Book would eventually classify more than 90 percent of these as “identified,” meaning they were caused by a known astronomical, atmospheric or artificial (man-made) phenomenon. The remaining 700 incidents remained “unidentified”; these included cases in which there was insufficient information to assign the event a known cause.

In 1966, the Air Force had requested the formation of another committee to look into the details of 59 UFO sightings investigated by Project Blue Book. The committee, headed by Dr. Edward Condon and based at the University of Colorado, released its “Scientific Study of Unidentified Flying Objects”–better known as the Condon Report–in 1968. According to the Condon Report, the sightings they examined showed no evidence of any unusual activity, and recommended that the Air Force stop investigations into UFO-related incidents. In 1969, in response to the Condon Report as well as a declining number of UFO sightings, Project Blue Book was officially brought to an end; among its conclusions were that of the sightings categorized as “unidentified,” there was no evidence submitted to or discovered by the Air Force that they were the result of technology beyond the range of modern scientific knowledge or that they were extraterrestrial vehicles.

“Ufology” Continues

Despite the dismissive attitude expressed by the Condon Report and the subsequent dismantling of Project Blue Book, civilian investigations into UFOs continued, as many “ufologists” were dissatisfied with the government’s conclusions. In 1974, the astronomer J. Allen Hynek, who had served as an adviser to Project Blue Book, created the Center for UFO Studies (CUFOS). This organization continues to look into UFO sightings and to weigh the hypothesis that they could be evidence of extraterrestrial activity.

In addition to UFO investigations conducted in the United States, similar work has been done over the years in other countries all over the world, including Canada, the United Kingdom, Australia, Greece and Sweden. In January 1979, the British House of Lords even held a three-hour-long debate on the subject of UFOs and a motion (eventually defeated) that the British government should make public what it knew about them.

East Tennessee 'UFO' identity a mystery

When UFOs Buzzed the White House and the Air Force Blamed the Weather

1952 was the year America caught flying-saucer fever.

So when a rash of strange sightings was reported in the skies over Washington D.C. that summer, the press and the public demanded answers. Were these unexplained radar blips, crafts that in some cases outran jets, part of a nuclear-armed Soviet invasion—a very real threat at the height of the Red Scare? Or were they evidence of something far more mysterious?

The Washington, D.C. sightings of July 1952, also known as “the Big Flap,” hold a special place in the history of unidentified flying objects. Major American newspapers were reporting multiple credible sightings by civilian and military radar operators and pilots—so many that a special intelligence unit of the U.S. Air Force was sent in to investigate. What they found—or didn’t find—along with the Air Force’s official explanation, fueled some of the earliest conspiracy theories about a government plot to hide evidence of alien life.

UFO mania takes hold

Pilots E.J. Smith, Kenneth Arnold, and Ralph E. Stevens look at a photo of an unidentified flying object which they sighted while en route to Seattle, Washington, 1947.
Pilots E.J. Smith, Kenneth Arnold, and Ralph E. Stevens look at a photo of an unidentified flying object which they sighted while en route to Seattle, Washington, 1947.Bettmann Archive/Getty Images

It all started in 1947, when a search-and-rescue pilot named Kenneth Arnold reported nine “saucer-like things…flying like geese in a diagonal chainlike line” at speeds exceeding 1,000 m.p.h. near Mount Rainier in Washington State. Within weeks, “flying saucer” sightings had been reported in 40 other states.

In the name of national security, Air Force General Nathan Twining launched Project SIGN (originally named Project SAUCER) in 1948, the first official military-intelligence program to collect information on UFO sightings. Its investigators dismissed the vast majority as hoaxes or misidentifications of known aircraft or natural phenomena.

But a few cases remained “unexplained.”

By 1952, the UFO-investigation unit was called Project Blue Book, led by Captain Edward Ruppelt at the Wright-Patterson Air Force Base in Dayton, Ohio. Ruppelt and his team would probably have continued to investigate a couple dozen sightings a month if not for the April 1952 issue of LIFE magazine. Just above its knockout cover shot of Marilyn Monroe ran an equally eye-catching headline: “There is a Case for Interplanetary Saucers.”

The article, written with Ruppelt’s full cooperation, explained the Air Force’s national-security interest in UFOs. And it made a convincing case—through the colorful retelling of 10 unexplained UFO “incidents”—that these unidentified objects were extraterrestrial in origin. As one rocket scientist working on “secret” projects for the U.S. told LIFE: “I am completely convinced that they have an out-of-world basis.”

According to The Washington Post, the number of UFO sightings reported to the Air Force jumped more than sixfold, from 23 in March 1952 to 148 in June. By July, the precise conditions were in place for a wildfire of UFO mania: widespread Cold War anxiety, mainstream press coverage of unexplained UFO incidents and a healthy dose of “midsummer madness.” All that was needed was a spark.

Mysterious radar blips buzzing over the White House

The Washington National Airport, 1953.
The Washington National Airport, 1953.PhotoQuest/Getty Images

Shortly before midnight on Saturday, July 19, 1952, air-traffic controller Edward Nugent at Washington National Airport spotted seven slow-moving objects on his radar screen far from any known civilian or military flight paths. He called over his supervisor and joked about a “fleet of flying saucers.” At the same time, two more air-traffic controllers at National spotted a strange bright light hovering in the distance that suddenly zipped away at incredible speed.

At nearby Andrews Air Force Base, radar operators were getting the same unidentified blips—slow and clustered at first, then racing away at speeds exceeding 7,000 mph. Looking out his tower window, one Andrews controller saw what he described as an “orange ball of fire trailing a tail.” A commercial pilot, cruising over the Virginia and Washington, D.C. area, reported six streaking bright lights, “like falling stars without tails.”

When radar operators at National watched the objects buzz past the White House and Capitol building, the UFO jokes stopped. Two F-94 interceptor jets were scrambled, but each time they approached the locations appearing on the radar screens, the mysterious blips would disappear. By dawn of July 20, the objects were gone.

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Nobody bothered to tell Ruppelt, the Air Force’s lead Project Blue Book investigator, about the sightings. He found out a few days later when he flew into Washington, D.C. and read news reports. Ruppelt tried to get out to National and Andrews to interview radar operators and air-traffic controllers, but was denied a government-issued car or even cab fare. Frustrated, he flew back to Ohio with nothing.

The very next Saturday, the UFOs were back over the nation’s capital. Again, Ruppelt found out through a phone call from a reporter, and immediately called on two Air Force colleagues to check out the situation at National. The same radar blips were back, and radar operators wondered out loud if the dozen or so objects on their screens couldn’t be caused by a temperature inversion, a common phenomenon in D.C.’s hot, muggy summer months.

A temperature inversion occurs when a layer of warm air forms in the low atmosphere, trapping cooler air beneath. Radar signals can bounce off this layer at shallow angles and mistakenly show near-ground objects as appearing in the sky. Ruppelt’s Air Force colleagues, however, were convinced that the objects on the radar screen weren’t mirages, but solid aircraft.

To be safe, two more F-94 jets were scrambled to chase down the unidentified targets appearing on radar screens at both National and Andrews. A game of high-speed Whack-a-Mole ensued, where the jets would race to a location targeted by radar, only for the blips to vanish. Finally, one of the jet pilots caught sight of a bright light in the distance and gave chase.

“I tried to make contact with the bogies below 1,000 feet,” the pilot later told reporters. “I saw several bright lights. I was at maximum speed, but even then I had no closing speed. I ceased chasing them because I saw no chance of overtaking them.”

Averting mass panic with a disputed theory

Captain Edward Ruppelt, standing, and General John Samford, seated to the right of him, discussing the reports of unidentified flying objects with other Air Force officers at a 1952 news conference.
Captain Edward Ruppelt, standing, and General John Samford, seated to the right of him, discussing the reports of unidentified flying objects with other Air Force officers at a 1952 news conference.Bettmann Archive/Getty Images

The next day, newspaper headlines across America screamed “Saucers Swarm Over Capital” and “Jets Chase D.C. Sky Ghosts.” The publicity and public panic over the sightings were so great that President Harry Truman himself asked aides to get answers. When they called Ruppelt, he said it could have been caused by a temperature inversion, but more investigation was needed to fully explain both the radar images and credible eyewitness accounts.

But before such an in-depth investigation could take place, the Air Force called a press conference, the longest such news event since World War II. The Air Force brass had decided, without consulting Ruppelt or the Project Blue Book team, that the best response to the sightings was to feed the press and the public an easy-to-swallow explanation.

Dodging specific questions about what pilots and radar operators had seen in the skies over the Capitol, Major General John Samford came back again and again to the temperature-inversion theory. Never mind that Ruppelt had since come to the opposite conclusion.

“The investigators had ruled out the inversion,” says Alejandro Rojas, editor of the UFO news site OpenMinds. “They had examined that situation. The radar operators said, ‘Inversions happen. We know what inversions look like. This is not an inversion. This is not the same thing at all.’”

To Ruppelt’s disappointment, the Air Force’s press conference worked exactly as planned. The papers reported the temperature-inversion story and the public largely seemed to accept it. In his 1956 book, The Report on Unidentified Flying Objects, Ruppelt reports that after the press conference, UFO sightings dropped from 50 a day to 10.

Skeptics, however, weren’t satisfied with the pat government response. Many accused Air Force and Project Blue Book investigators of devious behavior and secret knowledge. It wasn’t until Project Blue Book documents were made public in 1985 that UFO sleuths could see that the closest thing to a government cover-up of UFO sightings in the nation’s capital was actually a conspiracy of ignorance.

“The Washington UFO flap perfectly illustrates the real government ‘cover-up’,” says Nick Pope, a UFO journalist who used to run UFO-investigations unit for the British Ministry of Defense. “It’s not a situation where the authorities conspired to keep some terrible truth about UFOs from the people, but rather, the government doing its best to keep people from realizing that they didn’t have all the answers.”

Sources:

https://www.history.com/topics/paranormal/project-blue-book

https://www.history.com/news/ufos-washington-white-house-air-force-coverup

https://www.newyorker.com/news/daily-comment/the-unexplained-phenomena-of-the-ufo-report

https://lithub.com/revisiting-the-infamous-hill-case-in-an-era-of-more-ufo-news-and-government-secrets/

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