Assault On Control Room Warthog/Golden Elite Trick
When you get your Warthog from Foehammer or Echo 419, after you get to the room where the Golden Elite with the plasma sword locks the door on you, run outside to get your Warthog (Must have Marines in it). If you drive it correctly, you can get to the door inside the place. Slam the Warthog in to the door and leave it there. Then get out of the Warthog and continue with your mission. When you are done you open the door later on in the level, you wont have to fight the Golden Elite because your Marines in the Warthog have already finished it off!
P.S. The Warthog also helps you get out of the area because there are about three invisible Elites guarding the entrance to the place.
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