Get and use a grenade launcher, then it the helicopter with 2 rounds (2 x 6 grenades) it
will come apart and fall.

sniper rifle works too

there are rpgs around use them when the chopper stops

were can you find the grenade launcher i looked everywere.

They are on the ground on the North end of the town.

I have stayed close to the corner where the RPG can be found, and let the enemy come to
me........but after half an hour, I got tired of waiting to be able to get a decent shot
at the chopper.......I had 'taken out' countless numbers of enemy...but presumably, they
will still keep on coming. By going out into the open I have found that no sooner do you
get the chance to take out the chopper, you get swamped by more soldiers! thus getting
waisted! Threaders!!

Cracked it! As per the above answer.....but keep firing at the chopper with AK47 and
reloading from dead enemy around you (there will be plenty)....by emptying a mag at the
aircraft, then taking a few moments to fire at enemy, then back to chopper. Any damage to
the chopper gets carried over, to the re-start (should you get waisted) Took me around six
mins to finish the level.
Good hunting guys! Happy bunny now!

I was also strugleing to conqure this mission. But now I will try get the RPG's and other
guns and try shoot the chopper down. Thanks a bunch guys!