I'm not ready to say that it's beings from another planet, but I don't have the dismissive, "Yawn," attitude, either. These pilots are seeing SOMETHING! To say it's nothing is being in denial. It's SOMETHING. Alien? I find it hard to swallow. And yet, the other explanations make no sense to me either. Secret military projects? These are military pilots! They are already privy to top secret information. You brief them and say, "Look, this is something that can not be released to the public," and they shut up about it. Not only that, if you believe it's military, then we're talking about some really stupid people running the project. Instead of operating somewhere that the machines can't be spotted, they fly them near U.S. Navy task forces where RADAR and fighters can pick them up. I don't know. I'm hoping we find out during my life time. Doubt it, though.
They're definitely seeing something. What it is I could not say, or even guess at this point. And if there's even a 1% chance that it is of extraterrestrial origins that's pretty amazing.
"Every record has been destroyed or falsified, every book rewritten, every picture has been repainted, every statue and street building has been renamed, every date has been altered. And the process is continuing day by day and minute by minute. History has stopped. Nothing exists except an endless present in which The Party is always right." - George Orwell, 1984