in 1947 there were many reports of ufos performing incredible stuff, from citizens, high ranking officials and scientists. Both the public and intelligence committee grew convinced that something was hiding amongst the clouds.
in late june of 1947, the airforce launched an investigation called project sign (who btw was cofounded by the general who inspected the roswell crash) into the sightings as they suspected it might be russian tech. by late september the existence of these advanced craft could not be eliminated.
by the summer of 1948, a number of credible and well documented ufo cases, could not be solved. these cases became known as the "unknowns"
by the process of eliminated project sign concluded, that the most probable explination for the most unexplainable cases, was the extra terristial hypothesis. in other words, the unknowns did not appear to be from this earth.
however, the pentagon rejected this and disbanded project sign thereafter. they launched a selfadmitted by the guy who ran it, a bullshit program that wasnt based on science, project bluebook. it was a show for the public.
ufos got hidden for 70 years.
but now the roof is being blown off.