It's very difficult to analyse this kind of thing 10 years after the event, when all the relevant information has already been sifted and parts selected out so as to point towards a particular conclusion.
Here and now, I can't confirm any of the "facts" myself. Instead, I need to rely on the reports given here, which no doubt have been ripped from some pro-UFO site on the web.
Even if the facts have been accurately reported, there is nothing to say that the original reports are correct, either. People make mistakes and often come to wrong conclusions about things, even when they have personally witnessed them. To take just one example, the estimation of the speed of an object from a visual observation (or even radar in some circumstances) relies on a correct perception of the distance to the object from the observer. If the object is closer than you think, your estimate of its speed will be larger than the actual speed.
There are many, many issues such as this which need to be examined, but we, sitting here now, just don't have access to all the information needed to look at this thoroughly. Given that lack, I would be inclined to fall back on reports made by reliable investigators who did have access to all the information. However, nobody has yet pointed me towards a definitive government report of the outcome of investigations, or similar source.
The only conclusion I can reach at this point is that the matter is unexplained. I see no evidence of extraterrestrial visitation, and even if all the facts are perfectly accurate, there are other, more prosaic, explanations (e.g. secret US testing of advanced aircraft).