[@Frengo] It really depends on what their character would be like. If they were that character that was called in for the most impossible missions, then probably RC or ARC. If they proved themselves to be the best of their standard unit and were chosen for the assignment because of this, probably the CT codes.

If you need any help with this kind of stuff, though, I could help you out a lot. I'm fairly expertised in Star Wars Lore, at least around the Clone Wars Era.