[Bloody Sam Roberts]

First of all, the title is ridiculous.

"Do Pilots Believe in UFOs?"

Any pilot who does not believe that there are, indeed, Objects that Fly that are Unidentified needs to go back to school.

"Do Pilots Believe in Alien Spacecraft?" would be much more to the point. But when did UFO become synonymous with Alien Spacecraft?

[Army Air Corps]

Same with skywatchers; you’ll see many odd, difficult-to-explain things in the night sky. That doesn’t necessarily mean that Marvin the Martian is popping over for a visit, though.