1) Put an invisible H where you want the helo to land. Put the Transport Unload waypoint on it.
2) put helo1 land "LAND"; "unassignVehicle _x" forEach (units group as1)[/b] in the OnActivation field of your Transport Unload waypoint. That will unload them all except the player as soon as it touches down, and it should touch down...
I think as1 was the leader of the player's group. Not sure. If it's someone else, replace as1 with the right name
Cheers,
CareyBear