If you want to become an admin and be part of the admin "inner circle", not to mention get invited to games more often, you should add .hack// to your name. Ex: .hack//Your name here.
If you want colour in your name .hack// must begin with ^5. Your name can be any colour you wish.
Alternately you can use (DHK) tag.

If you have any Steam friends that are good at MW2 feel free to invite them!