Editing Project Sign (section)

==Caldwell investigation==
In May 1949, officers of Project Sign received a letter from an aeronautical company shareholder, who explained that the company had been building aircraft similar to the "flying saucers" which were then a popular topic in the press. This was during the UFO craze following [[Kenneth Arnold]]'s reports of [[Kenneth Arnold unidentified flying object sighting|seeing UFOs]] over [[Mount Rainier]] and the [[Roswell Incident]] that followed. The Air Force had canvassed for reports of flying saucers, and the shareholder apparently felt that inventor [[Jonathan Edward Caldwell]]'s disk-rotor might explain them.

Tracking down the leads, the team, accompanied by the Maryland Police, visited an abandoned farm in [[Glen Burnie, Maryland]] (outside Baltimore), where the damaged remains of Caldwell's disk-rotor aircraft were discovered. They also tracked down Driggers, who told them the story of the attempted flight in 1937–8. The team reported that the prototypes could not be responsible for the "flying saucer" reports that were being received from all around the country.<ref>Just old contraptions, "Flying Saucers" find proves false alarm, ''The Los Angeles Times'', August 21, 1949</ref>

Photographs of the broken disk-rotor machine continue to appear in UFOs books to this day. They were often described as "crashed" flying saucers in earlier works, claiming it was one more example of the USAF being in possession of such vehicles. More recently they are normally connected with the claims that the [[Nazis]] had built working [[flying saucers]] late in the war, lumped together with other disk-shaped aircraft like the [[Avrocar]], [[Sack AS-6]] and [[Vought V-173]], in an effort to demonstrate that such aircraft were both possible and well-researched.<ref name=saucers>{{cite web |url=http://www.greyfalcon.us/An%20Aeronautical%20History%20of%20Flying%20Saucers.htm |title=An Aeronautical History of Flying Saucers |accessdate=2011-02-11 |archive-url=https://web.archive.org/web/20101217101425/http://greyfalcon.us/An%20Aeronautical%20History%20of%20Flying%20Saucers.htm |archive-date=2010-12-17 |url-status=dead }}</ref>