I have seen some of those unmarked black helicopters twice a couple of years ago. Both times that I have seen them, there were three of them flying in a V shaped formation.
I noticed at the top center of the rotor on each one of these bad boys there was a large bulb shaped object.
Some sort of pod for avionics or something?
There are many stories out there about the Black Helicopters linked with the U.F.O. activity.
I've heard that they belong to the D.E.A., and they use them for drug sting operations.
Of course that could, also be a cover story?
Perhaps they are used for more sinister reasons?