A lot of this (not necessarily all of it) is just Word Games.
If you are a beginner bird watcher, you are likely to see a bird you can’t name. Congratulations — you have seen an unidentified flying object.
Navy pilots see stuff that they can’t identify, perhaps visually, perhaps in readouts on instruments. Yes, UFOs have been spotted.
On the one hand, these Navy Pilots may be seeing alien spacecraft from advanced civilizations.
On the other hand, these pilots may have just seen stuff they didn’t recognize.
Either way it’s interesting. But a lot of these stories seem to be worded in a way that says “We now know aliens exist”. And, in fact, that’s not true.
Likelyhood...zero
On the other hand, these pilots may have just seen stuff they didn’t recognize.
Likelyhood...99.99999999999%
It is my opinion that these Navy pilots are seeing spacecraft from a highly advanced civilization. But not necessarily an extra-terrestrial civilization.
These craft could be the technology of a highly developed intra-terrestrial civilization that has been on earth tens of thousands of years, and what is being seen as ET spacecraft is really their technology evolved to such a degree that we just think is ET.
They have evolved in ways that we can not yet understand, adapted to living in earthly environments that provide them protection from ignorant invasive surface humans.
There have been many reports of seeing unknown craft entering or emerging from various bodies of water without seeing any evidence of harm to the craft.
Think of all the ancient monuments that modern abilities would find impossible to construct today.
Perhaps we are not the only intelligent beings on earth, just that we are the less intelligent co-inhabitant of earth.
Have a good day now.
Topsail