The Charr.
If you don't understand what I mean, or know what they are, here's a quick rundown.
The Charr are a military force split up into three groups.
Blood, the body and soul. They're the infantry on the field, the warriors fighting the open battles.
Iron, the shield and gun. They're the ones who build the machines of war and use them.
Ash, the mind and dagger. They're the stealth group, working from the shadows.
All three groups are rivals with one another, and are run separately with their own ranks and their own goals. They're lead by the Arbiter, someone they all respect.
Where I'm getting with this? Why not run this group similarly. As [member="Alyssa"] and [member="Darth Raven"] said, having different departments would be pretty neat to see.