How to Get the 'Danger Close' Achievement in Call of Duty: Modern Warfare 3

The guys over at Achievement Hunter have a really great compilation of Modern Warfare 3 achievement guides. I mean, why else would we showcase them here? This one is for 'Danger Close' on the "Bag and Drag" level, and will net you a cool 20G, or a bronze trophy if you're on PlayStation 3. Basically, you have to target a helicopter so your buddies up in the AC-130 will shoot it down for you. I haven't even thought of trying this one out, so I guess I know what I'm doing when I get home today.