"Project Sign" was followed up by the more known, "Project Blue Book". from March 1952 through December 17, 1969. According to the "Official Fact Sheet of the U.S. Air Force":
No UFO reported, investigated and evaluated by the Air Force was ever an indication of threat to our national security;
There was no evidence submitted to or discovered by the Air Force that sightings categorized as "unidentified" represented technological developments or principles beyond the range of modern scientific knowledge; and
There was no evidence indicating that sightings categorized as "unidentified" were extraterrestrial vehicles.
Further on, the fact sheet has the following entry:
Since the termination of Project Blue Book, nothing has occurred that would support a resumption of UFO investigations by the Air Force. Given the current environment of steadily decreasing defense budgets, it is unlikely the Air Force would become involved in such a costly project in the foreseeable future.
In his appearance on CBS News' Face the Nation, Carson responded to a declassified Pentagon report released last week that detailed hundreds of unexplained UFO sightings by U.S. Navy pilots since 2004. He chaired a classified briefing over the nine-page report that has since sparked extraterrestrial intrigue and stirred up decades of U.S. government and alien conspiracies on social media.
As to Kenneth Arnold's nine unusual objects, the same report stated:
the objects of this sighting were due to a mirage.
The following quote and pictures come from an article by "The National Museum of the U.S. Air Force, Dayton, Ohio:
Enter the Avro Canada VZ-9. The Avrocar was a VTOL – vertical takeoff and landing – aircraft developed in Canada by Avro Aircraft Ltd. as part of a secret U.S. military project carried out in the early years of the Cold War.
The "Avrocar Cars", below, were finally constructed, depending on the website, between 1957 and 1959. The first test flight was November 29, 1959 and the last test was in September 1961.
The newly declassified documents reveal plans for the plane to reach a top speed of Mac 4, four times the speed of sound. It would also climb to an altitude of 100,000 feet. At the time, executing the project would have cost more than $3 million or $26 million in today’s terms. If it had been completed, we would have created a saucer that could spin through the Earth’s stratosphere at about 2,600 miles per hour.
Many times, in the history of our civilization the introduction of a new thought has brought skepticism, even ridicule. Despite this, there always has remained the duty and inalienable right to tell the people the truth. The Motion Picture you are about to see is true. It is not fiction. Much of the information in it has never been told. You will see it here for the first time.
IF you lived in my 1950's Los Angeles, you became accustomed to air raid drills, drop and cover drills in schools, and government motion picture and television informational spots about the Soviet Union and what you needed to do in the event of an Atomic Bomb attack on your city. Civil Defense spotters were told to watch for high flying Soviet Aircraft that were being misidentified by non-qualified civilians as "Unidentified Flying Objects", or "Flying Saucers".
Many 'Cold War Era" movies and television programs played upon our fear of a Soviet Atomic attack, the 1952 motion picture "Invasion U.S.A." and the 1953 television series "I Led 3 Lives", starring Richard Carlson, are prominent examples.
While both the motion picture and television industries saw an audience potential in escapism Science Fiction stories based upon all the UFO reports. This led to television programs like 1949's "Captain Video and his Video Rangers" and motion pictures like 1951's "Flight to Mars"
The following motion pictures are in sequential order based upon the dates of their releases and starts with the very appropriately named:
THE FLYING SAUCER released on January 5, 1950
The motion was produced, written, directed, and starring forgotten Columbus, Ohio, born "B" actor, Mikel Conrad. This is the first motion picture to deal with "Flying Saucers", but it turns out that the saucer was made by an American scientist, who is a "Commie Sympathizer", and wants to sell it to Stalin.
THE THING FROM ANOTHER WORLD released April 27, 1951
Howard Hawks', or is it, Christian Nyby's, "The Thing from Another World", cheats the 1951 audience. They never see the actual "Flying Saucer", but through the dialogue and scenes of the Douglas C-47's crew and accompanying scientists, their imaginations run wild and paint a picture of its size.
THE DAY THE EARTH STOOD STILL released on September 18, 1951
From one bad movie to another, but more laughable.
KILLERS FROM SPACE released on January 24, 1954
There's nothing like Peter Graves being given a tour by the Fried Egg Eyed Aliens their "Flying Saucer" on a flat screen television set.
This was a children's film and the "Supersonic Saucer" is an alien from Venus, that can turn itself into a flying saucer. British children at a boarding school, have to rescue the alien named "Melba" from a gang of criminals. Think Spielberg's 1982, "E.T. The Extra-Terrestrial", 26-years earlier.
Two days after the United Kingdom's "Supersonic Saucer", in the United States, Metro-Goldwyn-Mayer released what would become a classic of 1950's Science Fiction.
The source material was based upon the 1953 non-fiction book, "Flying Saucers from Outer Space", by ex-Marine Corps Naval Aviator, Major Donald Keyhoe. After the First World War, Kehoe wrote an autobiographical work, 1928's, "Flying with Lindbergh", about managing Charles Lindbergh's 1927 coast to coast United States Tour. Next, he became a writer for "Weird Tales" and other pulp publications.
There were two major writers on the motion picture. Turning Major Donald Keyhoe's work into a motion picture story, went to Curt Siodmak. Siodmak wrote, among others, the screenplay for Universal Pictures, 1941, "The Wolfman", and the classic 1942 Science Fiction novel, "Donovan's Brain". My article on Curt and his brother Robert, who worked together on Universal Pictures. 1943's, "Son of Dracula", entitled, "CURT and ROBERT SIODMAK: Horror and Film Noir", will be found at:
Curt Siodmak's story was turned over to screenplay writer George Worthing Yates, among his work is the story and screenplay for 1954's, "THEM!". My article, "George Worthing Yates: Screenplays from 1927's LIGHNING LARIATS to 1962's KING KONG VS GODZILLA", will also be found at:
Producing this motion picture and bringing everyone together was Ray Harryhausen's partner since 1955's, "It Came from Beneath the Sea". My article, "CHARLES H. SCHNEER: Ray Harryhausen's Producer/Partner", is at:
However, Corman also has one of the most uninteresting "Flying Saucers", briefly seen at the start of the movie.
The motion picture was actually shot in November 1956.
Most people recognize Bela Lugosi, Vampira, and even Tor Johnson in the picture. For those who might be interested in the other cast members, my article "The Strange Dead and Living Cast of Ed Wood, Jr's, 'PLAN 9 FROM OUTER SPACE" may be read at:
KRONOS released in April 1957