ATV's and snowmobiles assist the BP in improving their patrols for hunting illegal aliens on the border. Wait, ATV's are expainable, but snowmobiles? Yes, snowmobiles, even though you might not think it snows in the southwest, but it is possible, and the BP need to be prepared for any condition, including snow. ATV's are also used so they can work on all terrains, and they do this with ATV's sometimes.