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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Get in Pelican
On the ramp the scarab blows up the scorpion, a Pelican dropship unloads marines. (this is before you go into the building, while you are on the street) If you park a wraith on the top of the ramp you can jump near the open hatchway and hold "x," you should get in the side seat. (you may get pushed out by marines) the ship takes off after a few seconds and flies over the place you are supposed to go and out of the map. It then crashes into a wall and eventually onto an invisible strip of ground.