i was wondering if anyone can give me a tip on SOCOM: Navy Seals. i cant remember what mission it is w/out getting into the game and looking but there is a mission where you must shoot a helicopter down when it comes back to the camp. How do you shoot this thing down???? i have tried and tried but i keep getting killed! can anyone help??

I'm not familear with the game but maybe you need a more powerful gun or to be in a different spot for when the copter comes?