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.
“If my people, which are called by my name, shall humble themselves, and pray, and seek my face, and turn from their wicked ways; then will I hear from heaven, and will forgive their sin, and will heal their land.” - 2 Chronicles 7:14