Has been 15-20 years since I read the book, can't remember the name of it. It was about 5-600 pages with lots of photos filled with RAF reports during WW2 regarding what they called Fuerballs (sp). Many of the reports talked of their plane engines dying when these spheres would come close to them. I remember thinking it was similar to those stories in the 70's I would read about the person claiming to be abducted on the dark country road and their car died.
I believe there are probably aliens, maybe even running the show behind the scenes. But I believe many people who believe they were abducted by aliens were probably abducted by government and then has some kind of mind control memories planted. Definitely the technology started filtering in pre WW2 though, in my opinion.
RE: US Navy Patent For a 'UFO' Based on ET Technology Hits the Mainstream News