Troops in contact in Afghanistan calling for gun runs from an A-10 pilot. You can hear the seriousness in their voices, the chatter of machine guns in the background, and the pilot's ground proximity warning system telling him "Altitude, altitude". . . "Pull up! Pull up" as he's walking 30mm rounds from the GAU-8 Avenger gun in the nose onto the target while calmly plummeting straight towards the ground. Simply awesome.
The video doesn't include the aftermath, or whether the fires effectively stopped the fight or not, but it does give you an idea of how much caution goes into using such a weapon system on the ground. Nobody wants HE rounds hitting the wrong target.