This didn't work for me but I found something equally easy. There is an event that you have to take a chopper and shoot down other choppers. Just switch to the guided missiles and fire one at each chopper. I got 18 kills in this event. Leave the event then shoot down to more. It only takes one guided missile so get within a good range, fire, run (of fly in this case).
Last edited by Johnny Candles; 06-15-2009 at 04:35 PM.