In Halo 2 you got to pick from being a Spartan to an Elite. Halo 3, you got to pick from his/hers helmet, shoulders, and chest. With Halo Reach coming out Bungie decided to step it up.
As you can see in the picture above you get pick from a helmet, but notice you can pick what’s on the helmet. For example looks like you get to pick from a flashlight and where you want it to go. One question is, how are you going to unlock armor? Well, it looks like Halo Reach will be different from Halo 3, and Halo 3: ODST. Like in Halo 3/Halo 3: ODST you unlock armor from completing the campaign and achievements. In Halo Reach looks like you gets “points”, if you look in the picture (above) you can see 2356 points in the right hand corner. Looks like you gets points buy completing campaign and achievements.