Check the Exchange for your chance to grab the Fronkbox Back Accessory, the Duke Shoulders, and the OGX Sniper ... on the shoulder pads. All three items can be used in Halo 3 multiplayer included ...

Power weapons such as Sniper Rifles ... you earn credits from playing Halo: Reach you find that you can customise your Spartan with various helmets, shoulder pads, chest pieces and the like.