NASA was formed in 1958 and from the start a number of it's astronauts
and test pilots testified to sighting UFOs or craft of undetermined
origin. Initially Joseph Walker was the first to announce a sighting -
he told the National Conference on the Peaceful Uses of Space Research
in 1962 that he had an aerial encounter with two disc-shaped objects
the previous month. He had actually filmed the encounter.
In April 1962, NASA pilot, Joseph Walker, filmed five cylindrical and
disc-shaped objects from his X-15 aircraft. Another test pilot,
reported an incident involving a formation of UFOs whilst flying at
NASA refused to reveal any evidence that might substantiate the
pilots' claims - photographs or films were never released.