got the same problem

me, too

The helicopter is irrelevant. Just follow the direction marker and the story should
continue (as far as I remember you need to walk to a kind of river).

just wait for a bit and then it will come i was stuck on that bit

Near where the bunker part with all the metal is and them men keep pouring out of. kill
every one in it then to right and run of edge. you'll land on a ledge that leads to the
end of mission :)

how do you get to the ground thars where im stuck

How do you kill min with the RPG he fires from the wooden bridge

Ensure that you have the bullet shaped direction indicator at the start of the Bridge
level with the Countdown in metres to your destination.If you start the level and this is
not there then you have to restart until it is on the screen.Once you have this follow to
the end of the Bridges and into the water.The level ends and takes you to next level.I
just had to restart level and it worked for me.....

See my answer below.You must have the direction incicator at the start of the Bridge level