The armor pieces in Halo Reach are for purely aesthetic purposes and have no effect on gameplay whatsoever. Pick whichever piece suits your personality best.
it is on the chest piece of grenedier
It might be a high ranked Mark V variant, it is for the helmet
You get it when you reach commander.
It is unlocked at the rank of Colonel on Halo: Reach and costs 1,200 CR
If you are really good at it, Possibly
You have to be an warrant officer in halo reach to unlock the helmet you also have to go to halowaypoint and unlock the armor.
It's a Chest armor unlocked at Captain (either that or major).
An elite rapes him. Then he gets shot 5 times in the chest. Second person: haha very funny. were you the elite because no colonal died in halo reach as of what i know.
Technically no, the only way to wear armor in halo 3 that you can wear in reach is some of the basic armor that was already available but the new pieces of armor such as the security shoulders, sapper chest with robot arm, an gungir helmet are only available in Reach.
You don't unlock the arm, its part of a chest piece. I think any chest piece with the [R] has the robotic arm. I just got to Lt. Colonel the other day and that's when you can buy it. This page answers the question and has a video link showing the arm in theater mode, https://files.nyu.edu/jwi208/public/
the trauma kit it an armor piece that is for decoration only.
Eva helmet, left shoulder security, right shoulder marksman, chest grenadier