How do you get an assult rifle on your gamer tag in halo reach?

If your looking at this question like WHAT then what I mean is like how in halo 3 if you went on bungie.net and got that thing that's on your gamertag name. Just wondering. Other versions of this are the halo 2 emblem, a spartan helmet, and some cool designs.How do you get an assult rifle on your gamer tag in halo reach?The Assault Rifle is for participating in the Beta for Reach back in the month of May. But you can see all of the Nameplates by going to Bungie.net and signing into your Xbox Live profile using the email and password you used for your Xbox Live account. Then hover your mouse over the Profile option on the menu and go to the Halo Games Options choice on the pop-down menu from that.