In the 60's there was a design developed for nuclear pulse propulsion, which would allow vehicles to travel up to 10% of the speed of light. It was "officially" abandoned because it would produce toxic radiation in the atmosphere. Well, if you consider the possibility that Black Ops really doesn't give a hoot about the environment, then it could make sense that they actually produced the vessels and kept it secret. Remember it was the Germans in WWII who invented our basic Stealth fighter technology so this kind of stuff can remain under wraps for along time. One of the interesting features of nuclear pulse was that the bigger the vessel, the more feasable it was. In that aspect you could have an explanation for phenomena like the Phoenix lights.
Other legit UFO sightings exist too, but I highly doubt it is aliens, much more likely just very advanced, secret technology. During the cattle abductions out west, farmers saw military men outfitting helicopters to look like flying saucers, lol. I think the alien stories are planted diversions to keep people from knowing about some very cool tech that is kept under lock and key.
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