Here is an interesting comparison of Cortana over the course of the 4 halo games:
PTesh adds his dulcet prepubescent tones over the top of one of the new trailers for weapons...
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Level: Assault on the Control Room
On assault on the control room level on the part where you finally see the control room and you are on a natural bridge over the final part of the level. There are some banshees that typically some elites get into quickly. With the right elements of surprise and weapons (rocket launcher) you can get into one of the banshees (this is about equally difficulty in any level but the parts before are a lot easier on easy it doesn't affect the outcome) you can from here go directly to the end which saves you a large part of the level or you could fly up.