On the hovercraft at the end you have to kill him in the water with
the machinegun without being infect unless you have much boostershot.
When you do that he came on the ship. Then you go stand on the roof en
shoot with the multi launch on his wings when he open them for shoot
tjat insects that infect you./ Do this eight times then he is death.
End you being not infected. Then is there a little men that is scooting
around. If you do good you have one multi launch rocket yet. Shoot
that on that little men. And then kill him with the shotgun en flame
thrower. But that's taking a while.