Jea, as soon as you play for a longggg while and/or get to around 900-1000, you "beat the game". I've done it twice to date since I fist got my ipod, then I realised how stupidly hard/intense it gets about 4 minutes into it so I gave up.
i got 999 once and then they stopped comming and i was thinking to myself " they arew trying to be sneaky i can't take my eyes off this thing" and i stared at my ipod for a good 3 minutes untill i figured no more helicopters were comming.
no one believes me but there was like a glitch were almost the whole screen filled w/ copters but they didnt drop people so i just shot as fast as i could and got like 2300 or sumthin rediculous
i playing parachute rite now ima try to get to 1000 i got a fieldtrip all day just 1st period is normal so im here ima try to beat it and ill post if the helocopters go away