Footage (play with audio) taken from an AH-64 Apache military attack helicopter in service in Iraq.
As you can see, the twin pilot AH-64 all-weather day-night chopper is certainly not to be taken lightly. These unsuspecting targets can probably hear the chopper, but as the footage looks to have been taken at night, most likely they cant see it. The Apache however, can obviously see them from as far as 4km away. Targeting contacts is easy with its M230 chain cannon which fires 625 rpm with an maximum range of 4500m.