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enjoy the silence
Because they can :)
I am Harpuia, Ventus Airus
It's bungie, there's no reason they shouldn't have.
The Spartan 1 Project, the biggest, best and most active group on Bnet.
There are Easter eggs in nearly (if not) all games ever made. The Pinned topic on the right has a list of all ones found.
Unfreakin believable...
Why do you even need to ask that? If you know what an easter egg even is you should know why they're there. Or, better yet, why they shouldn't be there.