A small glitch this one, on assault on the control room after coming down from the first bridge, go over to the flipped warthog and somewhere there will be a rocket launcher, take it and keep it, just save a few rockets.
After killing every thing up to the part where you get the scorpion, look up after the scorpion bit before going into the next battlefeild, look up, this is a Banshee take of pad.
Whip out your rocket launcher and walk forward until the checkpoint is triggered, now turn on the rocket launchers scope and aim just to the right of the support beam into the centre, the banshee should fall down, if not revert to saved and repeat.
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