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In reply to the discussion: Intelligence Officials Say U.S. Has Retrieved Craft of Non-Human Origin [View all]Kablooie
(18,634 posts)and government task forces have discovered items that, somehow, were known by many people who, loyally, kept the secret for decades, ... there is still the question of who analyzed the items and determined they were of extraterrestrial origin? What were their qualifications and abilities?
I strongly suspect that if actual scientific analysis were done, assuming the objects exist, that other rational explanations would be forthcoming.
Also:
If a space ship was sent from the nearest star system to the earth at 1,000,000 km/hr, it would take over 3,000 years to get here.
Radio signals, that might alert another civilization of our existence, have only been sent out for around a century.
Given these time frames it's extremely unlikely that another civilization has already managed to send vehicles to earth.