They might be government/military projects that will be used eventually as as PSY-OP on the people -- you know, "We have to declare martial law and round you up into compact cities -- how else can we defend everyone against the Aliens?"
Or
"We all have to come together under one world government, or the whole world will perish against the Aliens."
See what I mean?
I also heard that, after "terrorism" plays out, "UFOs" will be next. It's on Cathinfo somewhere, but I don't have a link for you.
Matthew