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Example of the military use of unmarked helicopters, a unit referred to as "Night Stalkers".en.wikipedia.org...
Its missions have included attack, assault, and reconnaissance, and are usually conducted at night, at high speeds, low altitudes, and on short notice.
Interesting topic. Thx for the post. In one episode of Science Channels' excellent show, " Unexplained Files" this past season, one episode was about cattle mutilation, and in one instance a horse mutilation. The woman who lost her horse described some type of helicopter she thought, though in this case it seemed to make a whoosh-whoosh sound. In another example there was a man who didn't want to be on camera, but he said he had seen what he thought were these dark colored helicopters in an area where there had been cattle mutilations going on. One theorist who wasn't quite so sure that it was ufo's/aliens involved, speculated that some arm of the government was involved with the mutilations, as he thought they may be checking the food chain for possible problems, in this case the cows with mad cow disease a concern that appeared some years ago. So who they are and what they are doing is pretty much anyone's guess at this point.