In response to...
Coloring Vehicles; Just because we can color Mongooses doesn't mean we should color the other vehicles. I didn't like the idea that much.
Secondary; Well if you like the secondary trim like in Halo 2, for Coloring By Piece (Claiming it has, Helmet, Chest, R Shoulder, L Shoulder, Primary, and Secondary), you can still keep it that way. Color Everything black for example but secondary red. Color the shoulders red too if you want.