you cant do it in halo reach only in odst
You have to reach the rank of Lt. Colonal and then buy it for the required amount of credits. This page answers the question in more detail and links a vid showing the arm in theater mode - https://files.nyu.edu/jwi208/public/
she gets shot by a banshee
Robotic arms are often called prosthetic arms if they are on a person. If it is a robotic arm on a machine, then it is called a robotic arm.
A robotic arm achieves degrees of freedom by having multiple joints that allow it to move in different directions. Each joint adds a degree of freedom, which increases the arm's ability to reach and manipulate objects in various orientations. The more joints a robotic arm has, the more degrees of freedom it can achieve.
Robotic Arm Edge is recommeded for ages 12+
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/
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.
No; It's her armour
Halo reach is older
no, Masterchief is not in Halo: Reach. Halo: Reach is set before the discovery of Halo, if you have or Know about the Halo book: The Fall of Reach, it is a closer view of the plant reach. but there are some other Spartans in it!
There are no skulls in Halo Reach.