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: The Great Journey
Tyson "Ferrex" Green, lead level designer created most of the great journey and has left his mark in various places throughout the Halo series: Once you reach the control room go to the highest point possible (you will need to go by foot most of the way as the banshee wont go very high) then use the Sputnik Skull (see skulls guide) to jump to the highest pillar. There will be the word "Rex".