For Anyone That Dosnt Know About Thie Glitch You Can Skip 1/3 of Assualt on the Control Room
to do this procceed threw the stage like normal once you reach the point where you would normally loose the Tank due to it not fitting proceed forward and comendere the the banshee in the next pass. if your dont know how then the easiest way is to bring the warthog and take it up the hill then stand on the gun and flip the banshee with a rocket then drive over and get in it.
after you have got the banshee fly up to the bridges and land on the one closest to the mountian wall then procceed in the door just like normal if u do this the game glitches and no more enemies spawn for the rest of the stage
VERY VERY useful on Legendary