@strike: I won't say much, since I have too much to say but I don't see the need of it to be said here, so I'll just post a link to one of the incidents which would explain what I know and want to say:
http://en.wikipedia.org/wiki/1976_Tehran_UFO_incident
TLDR; Now, this is just one example closely monitored and witnessed by reliable and sane military personnel themselves. Time and again, it has been proved that whatever they try to tag as unidentified flying objects and pursue, maneuvers and accelerates defying all physics laws and sometimes jamming not even electrical but also mechanical systems within the pursuer jets, a technology which is so sophisticatedly advanced that it cannot belong to this planet. Neither any country has ever been capable of producing such things, nor will they be able to do the same in distant future. There are other strikingly unique characteristics (which you will find out when you read the link) that even I can't imagine are possible in nature. I have devoted thousands of hours researching on these incidents. And thus, I have many incidents in memory which, more or less, lead to the same conclusion- they are there. Even outer space expeditions have reported sightings of these unusually "glowing" and intelligently maneuvering and accelerating fleet of objects in earth's outer atmosphere at least 4 times, only to be dismissed by NASA which is nothing surprising.