Are governments hiding evidence of aliens? What do the records show?

What did governments really keep hidden?

Start with what is on the record. From 1947 to 1969, the U.S. Air Force collected UFO reports under names such as Project Sign, Project Grudge and, longest of all, Project Blue Book. According to the National Archives, Blue Book logged 12,618 sightings, and 701 of them remain “Unidentified.” The project closed on December 17, 1969. Its records have been declassified and are open to the public, with the names of witnesses removed.

Some things were kept quiet on purpose. In 1997, CIA historian Gerald K. Haines published a history called “CIA’s Role in the Study of UFOs, 1947-90.” It says the U-2 spy plane, which flew at 60,000 feet, set off a wave of UFO reports in the 1950s, because airline pilots flew far lower and saw its silver body shining in the sun. Blue Book investigators often knew the real cause and did not tell the public. Haines writes that this led the Air Force to make “misleading and deceptive statements” to the public, and that the deception later fed cover-up theories.

The same history says the CIA refused for years to reveal that it had sponsored a 1953 review of UFO reports, called the Robertson Panel. It released only a trimmed version of the panel’s report. According to AARO’s 2024 review, that panel had also recommended a public campaign to explain away UFO reports and suggested watching private UFO groups. Those are real reasons for distrust, and they deserve to be said plainly.

What really happened at Roswell?

What was observed. In June 1947, rancher W.W. Brazel found a large area of debris. As the local newspaper described it, the debris was rubber strips, tinfoil, tough paper, sticks and tape. On July 8, the Roswell Daily Record reported that the base’s intelligence officer, Major Jesse Marcel, had recovered a “flying disc.” The next day’s paper reported that General Roger Ramey had called the debris a weather balloon.

What was inferred. Starting in 1978, some researchers and authors argued that the debris came from a crashed alien craft, that bodies were found and that the military covered it up.

Does the evidence support it? In early 1994, at the request of Congressman Steven Schiff, the General Accounting Office (now the Government Accountability Office) began looking for records. The Air Force searched its archives, including classified files, and released its findings in a July 1994 report. It found no records of recovered alien bodies or materials. It concluded that the debris was most likely from a Project Mogul balloon. Mogul was classified at the time. Its scientists described their work in public as weather or balloon research, and new staff were told only that they worked on weather equipment. The report says it found no document ordering General Ramey to call the debris a weather balloon. He may have been steering attention away from Mogul, or he may have believed his weather officer. A 1997 follow-up report, “The Roswell Report: Case Closed,” looked at the stories of alien bodies. It concluded that they probably mixed up test dummies dropped from high balloons from 1953 to 1959, a 1956 plane crash that killed 11 airmen, and a 1959 balloon accident that injured two pilots. Over the years, the report says, events from many years were squeezed into a few days in July 1947.

What is unresolved. Some people do not trust the Air Force to judge itself, and that concern is understandable. But no document, sample or photo of an alien craft or body from Roswell has ever been made public.

What did the 2023 hearing and the 2024 review find?

On July 26, 2023, a House subcommittee held a public hearing on UAP, short for “unidentified anomalous phenomena.” Two former Navy pilots, Ryan Graves and David Fravor, described objects they could not identify. David Grusch, an intelligence officer for 14 years, said under oath that he was informed in his official duties of a “multi-decade UAP crash retrieval and reverse engineering program.” He also said he was speaking to “the facts as I have been told them.” Asked about bodies, he said the program had recovered “nonhuman” biological material, according to people he talked to. Asked whether he had seen the bodies, he said, “That is something I have not witnessed myself.” He said several times that he could share more only in a closed, classified setting. These are serious claims made under oath. So far, they are not backed by evidence the public can check.

In 2024, AARO published its historical review, Volume I (the report is dated February 2024). AARO reviewed every official U.S. effort since 1945 and interviewed about 30 people who said they knew of hidden programs. The report says plainly that many people sincerely hold these beliefs, based on their own experiences or on people they trust. Its main findings:

• AARO found no evidence that any U.S. investigation, academic study or official panel has confirmed that any sighting was alien technology.
• AARO found no empirical evidence that the government or private companies have reverse-engineered alien technology.
• In many cases, the people it interviewed had named real classified programs, but had wrongly linked them to aliens. None of them had worked on those programs or had firsthand knowledge of them.
• A metal sample said to come from a crashed craft was a manufactured alloy made on Earth, mostly magnesium, zinc and bismuth, with traces of other elements such as lead.
• AARO said some claims were still under review, to be covered in a second volume.

Separately, NASA asked an independent team of 16 outside experts, chaired by David Spergel of the Simons Foundation, to study UAP. Their report, published September 14, 2023, found no conclusive evidence in the peer-reviewed literature that UAP come from beyond Earth. It said the data needed to explain many sightings often do not exist.

What is the strongest objection?

The strongest objection is simple: “Of course the government says there is nothing. That is what a cover-up would say.” History shows that official statements have not always been honest. The U-2 story proves that.

But notice how we know about the U-2 and Mogul stories. They came out through the government’s own records and histories, decades later. Nothing like that has come out for alien craft or bodies. NASA’s team was also made up of outside experts, such as university scientists, not Pentagon staff. And a claim that can never be checked, because every missing piece is said to be hidden, cannot be tested at all. That does not make it false. It means it cannot yet count as evidence.

What do people often get wrong?

“Unidentified means alien.” It means nobody could identify it, often because the data were poor. Blue Book’s 701 unidentified cases are a list of unsolved puzzles, not a list of spacecraft.

“Classified means alien.” Governments classify many things, such as weapons, spy planes and satellites. AARO’s review lists real programs, such as Mogul and the U-2, that were mistaken for UFOs.

“People who ask are foolish.” They are not. The records show real deception. Asking for evidence is the right move. The fair next step is to ask the same of the alien claims.

How can you check this yourself?

• Read the records. The National Archives explains how to see the Blue Book files. The Air Force Roswell reports and the AARO review are free to read online.
• Separate the steps. For any claim, ask: what was seen, what was inferred, what evidence supports the inference, and what is still open?
• Ask who saw it firsthand. Grusch said he was told of the program. He said he had not seen the bodies himself. Secondhand reports are a lead, not proof.
• Look for checkable evidence. A sample tested by independent labs, a document shown to be authentic, or clear data from several sensors would matter far more than any number of retold stories.

For how official UAP reports sort sightings today, see our story What Do Official UFO and UAP Reports Actually Say? and our answer Have UFOs been shown to be alien spacecraft?

The answer stays the same after all this detail. Governments have hidden things about UFOs, and it is fair to say so. But the public record so far does not support the claim that they are hiding alien craft or bodies.