I figure they were either one (alien ships) or the other (secret government vehicles).

Well, I agree with this, but the next step is to assign (not necessarily numerically) the relative odds for each of these possibilities. Looking at all the evidence, the odds are overwhelmingly in favour of a human explanation of the kind you suggest. Sad but disappointingly true, and I'm not saying there's anything wrong with wild imaginings as long as you recognise them for what they are. Religion does the same thing for the explanation of the universe: picks out what is by far the most implausible explanation, going from the evidence, and fails to recognise its own wild imaginings for what they are. At least you and I cheerfully admit that we can't convince anyone of our respective sightings - lack of evidence being the main culprit, of course. Good luck with your UFO spotting.