: Has anyone seen these before or know what caused them?

I the Halo games, the armor of most things (Grunts, Elites, Spartans) are a dull gray color and shaders are applied to tint their armor. It appears the shader was screwed up causing the red Elite.

For the Honor/Councillor thing, variants of that appear in that Mausoleum section near the end of that part of the level. Sometimes that Elite doesn't have a helmet, I think sometimes it is full honor guard but without the red shading (still the white). I haven't seen the half-jaw variant myself, but knowing how the models are built, it's a standard Elite (like Half-Jaw is) but is loaded without the extra set of jaws switched on. Very strange.