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...
Four Hidden Banshees
Level: The Package
During this level when you reach the wooden shack type structure, clear out all the enemies. Have one player stay behind and one player go ahead. Behind a box at the back of the wooden shack (you will need to move it) a switch will appear for a few seconds right after player two activates a hidden switch that is a little further in the level. The hidden switch that player two needs to activate for the first switch to appear is off a small cliff to the left, right before you blow up the covie sniper tower. Once both players activate the switches 4 shiny new Banshees appear near the wooden shack.