Aliens.
or to make the post a little longer,
the guy says the Aegis cruiser is one of the most sophisticated ... something. Which it isn't. It's sophisticated for being a warship, but it's no' sophisticated when it comes to science stuff. Aliens do not magically appear on earth, they would have to come from not-here to here, travelling in the straight-line-there-to-here fashion, which would make them detectable to instruments of such accuracy that what the US-o-A military cannot even comprehend. NASA is far more keen on finding aliens that any alien-conspiracy activist is, and they got better gear to do the job.
As for the testimonies,
i watched a couple of Bob Lazar videos, and i got to tell you, i believe him. And, i also know now that he's full of shit. My human, instinctive judgement will never be a good substitute for the cold, hard facts of science.
When NASA announces we've been visited by aliens, i'll put my tinfoil hat on.