I've been slowly but steadily changing up the Chief's design to have it match closer to the actual game design. When I first started making up guest strips for One-One-Se7en I'd just do them straight from memory. They were almost never the same design twice and while close enough to get the point across, the actual designs were pretty far off from the source material.  

So I made the changes. Then the Arbiter looked outdated standing next to him and I made him a little more in the style of his Halo 3 incarnation. And since I find almost everything funny, I decided I could make a gag out of this little continuity change.

I hope you like them. But if you don't, please refer to panel 4. :P