Project Blue Book & UFO Cover-ups

The Story

In the summer of 1947, a private pilot named Kenneth Arnold reported seeing nine large circular objects flying in formation near Mount Rainier, Washington. According to the Pentagon's All-domain Anomaly Resolution Office (AARO), he said they periodically flipped and were traveling at 1,700 miles per hour, and compared their flight to the "tail of a Chinese kite." The flying-saucer age had begun.

The Air Force responded with a string of projects. AARO's history lists Project SAUCER, set up on December 30, 1947, which became Project SIGN, then Project GRUDGE, then GRUDGE again under Capt. Edward Ruppelt, who wanted "no wild speculation." In March 1952, the effort became Project BLUE BOOK, based at Wright-Patterson Air Force Base near Dayton, Ohio. It would be the longest-running UFO investigation the government ever had, with astronomer J. Allen Hynek as its lead scientific investigator.

"There are not now nor ever have been, any extraterrestrial visitors or equipment on Wright-Patterson Air Force Base." (U.S. Air Force fact sheet, 1985)

There was one tantalizing detour. According to AARO, Project SIGN staff in July 1948 allegedly drafted an "Estimate of the Situation" concluding that UFOs were "interplanetary" in origin. The Air Force chief of staff rejected it as lacking proof. Ruppelt later said all but a couple of copies were destroyed. AARO says the account comes from only one source, and that it has been unable to verify the claim or find the document.

The summer of 1952 brought a wave of sightings, including widely publicized ones over Washington, D.C. The CIA took notice, and in January 1953 it secretly sponsored a panel of scientists led by Caltech physicist H. P. Robertson. The panel concluded that most reports had ordinary explanations and found no evidence of a direct threat or of extraterrestrial origin. It also recommended that the government use various channels to debunk UFO reports and suggested monitoring UFO enthusiast groups.

Blue Book sorted its cases into identified, insufficient data, and unidentified. The identified pile was full of planets seen through haze, research balloons up to 300 feet across, sunlight glinting off aircraft, afterburner flames, birds, kites, searchlights and some confirmed hoaxes. In 1968, a University of Colorado study led by physicist Edward Condon, funded under a $325,000 Air Force contract, concluded that "further extensive study of UFOs probably cannot be justified in the expectation that science will be advanced thereby."

On December 17, 1969, the Secretary of the Air Force announced the end of Blue Book. The final tally, according to the Air Force: 12,618 sightings reported from 1947 to 1969, of which 701 "remain Unidentified." The Air Force said none indicated a threat to national security, and there was no evidence that the unidentified ones were extraterrestrial vehicles. A later Air Force fact sheet went further: "There are not now nor ever have been, any extraterrestrial visitors or equipment on Wright-Patterson Air Force Base."

The questions never quite went away. In 2021, an intelligence community assessment reviewed 144 reports of "unidentified aerial phenomena" from government sources and identified just one with high confidence, as "a large, deflating balloon." "The others remain unexplained," the report said. In March 2024, AARO published a historical review and stated that it "found no evidence that any USG investigation, academic-sponsored research, or official review panel has confirmed that any sighting of a UAP represented extraterrestrial technology." It assessed that claims of hidden programs were mostly the result of circular reporting. That leaves the story roughly where Blue Book left it: a stack of cases nobody could explain, and no proof of anything from another world.