The thing that has me wondering whether these are our DARPA fueled super secret squirrel projects or actual other worldly craft is that by one report, several pilots were experiencing them flying in a "military flight corridor". I don't remember the base, but it was out east, Florida I believe... Evidently they reported their sightings, had various sensor evidence and so on, but the powers that be seemed largely uninterested. My question would be why? If these things were "flying" the corridors our military pilots are, why is it that we are letting them continue? If that were a Chinese jet, you can darn well bet that we'd take notice.
On the flip side, if these things are in fact otherworldly, I don't care for all the secrecy. I know our government (or really most for that matter) aren't known for their forthcoming nature, but this would be a huge thing to keep from the world!