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...
Try upgrading your browser to Google chrome (you wont regret it). There is probably an IE...
If you kill all the brutes in a certain room the scared grunt in the corner will talk. He says "Please no hurt, me like Elites. Brutes stinky bad bad! Me stay here and make sure no brutes come behind mighty arbiter?". He comes up as green on your reticle marking him as a friendly unit.