So given that the majority of posters on this thread call BS, the question then becomes what is his motive or is he delusional...what's the thinking here?
Edit - I haven't seen any of the testimony as yet so I don't have an opinion of the man.
It is quite likely that the whistle-blower believes what they believe.
Does that mean that the US has some alien tech? I dunno and unless Congress outs this information, we can never be sure.
Even if the US has a thing but keep the thing secret then for practical purposes it might as well not exist. One would do well to proceed as if it did not exist, as least as far as most of us go. The Chinese and Russian governments may hold a different view.
If they admit to having a thing but keep it secret, ditto, except now we can speculate as the nature of the thing or if it is a disinformation campaign and whom it that aimed at.
It they have a thing and release it into the public domain, well won't that be fun,
Now for my personal wild assed speculation. The USAF and the USN are kicking off a sixth generation fighter programme. These aircraft will likely operate as the command element of a triad of drone aircraft that will do the strike missions.
If USAF and USN aircrew are reporting UAP/UFOs that cannot be detected by anything other than the mark one eyeball. That is an operational concern, if these observations are real. It is even more of a concern if these things are showing up on some sensors but not others. It would be a concern in current operations but at least the pilots are on the spot in visual ranges and in a position to give context to the phenomenon.
If the pilots are completely reliant on information relayed by drones, it would be very embarrassing if WWIII kicked off because some Navy pilot fired on a sensor ghost.
So, my guess, is the powers that be, want to make reporting UAP/UFOs respectable to track down sensor ghosts and while they are at it nail down once and for all if there is some oddity in the environment giving rise to some of this.