MW2 Spec ops -- Homeland Security.?

Just want to make sure i have the strategy right. Camp myself on the roof of the burger town across the street right? Have most of the other missions down on veteran and this one just seems to be a pain. Keep getting to 1 heli left on the final wave hahah...i cant imagine what 15 juggys is gonna be like if this is giving me trouble...am i doing this op right?