I am unimpressed with how stealth these choppers are if they get a thread in the bbs. As for the training mission, flying above US cities is one thing, but flying just over rooftops and between buildings sounds a little too intimate for my comfort. And, they should paint those things pink during training exercises, so no one gets scared.
One of our hilltops is on a flyway between Ft. Hood and somewhere south. You want loud? Be up there when 6 or so Chinooks fly over, low.
Uh... you do realize that Afghanistan is not the only area where the US military operates? And that occasionally military operations take place in cities?
Oh, and, uh... Helicopters don't operate in caves. Anywhere. Anywhere on the planet, or anywhere in this universe. Unless they were bought from a toy store, I suppose.