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...
Roses vs Violets Achievement
Level: Spartan Ops - Episode 5 "CORE"
This is one of the Red v.s Blue Easter Egg references in Halo 4. This particular egg gives you an achievement of 20G. On Core, sprint over to the left ramp up and head to the edge of the balcony and look for a small equipment box. Shoot the box once (Preferably with a DMR) to activate the small Red v.s Blue sound clip and achievement. If you are having trouble understanding then please watch the video provided below showing you step by step how to obtain this achievement and discover the egg. Check out the other Red v.s Blue Easter Eggs in the Halo 4 section of our site. Keep hunting!