 This video is a set of clips from training exercises using a gattling gun according to the caption for the video. The various clips include gunners firing the gattling gun from a heliocopter, from the back of a humvee, and from what looks like a helicopter gunship. It looks like a firehose when the guy is firing it from the helicopter with a constant stream of tracers shooting out and exploding on the targets (which look like junk cars). It also includes various shots using night vision. The color of the tracers from the helicopter gunship gattling gun seem to be a different color as well (more of a red) and they look like a volcano bouncing up after hitting the target.
Watch the full video of the training exercises with a gattling gun below or click over and view it on the host site. Source: Google Video | 
