Obviously some people arent reading the first post.
He is requesting the name for the paint that is best recommended to get Master Chief's color in Campaign, not your matchmaking colors, or anything.
Most people use Olive Drab or an oregano color. For my first MKIV I used oregano, and the second I used Olive Drab. Oregano, I think, looks the best with Battle damage, otherwise its a little flat. If you dont plan to battle damage, I would go with Olive Drab.