Officially, aliens have never existed but flying saucers
very nearly did. The National Archives has recently published never-before-seen
schematics and details of a 1950s military venture, called Project 1794, which
aimed to build a supersonic flying saucer.
The newly declassified materials show the U.S. Air Force had
a contract with a now-defunct Canadian company to build an aircraft unlike
anything seen before. Project 1794 got as far as the initial rounds of product
development and into prototype design. In a memo dating from 1956 the results
from pre-prototype testing are summarized and reveal exactly what the
developers had hoped to create.