Automail

Automail is a concept that was introduced in the manga series of Full metal Alchemist. In the story line the device was intended to help those who lost their arms or legs during the war. But the application for the Automail changes as the user of this devise started to be drafted as a soldier.And most of the injured soldier who went on with this procedure started going back to war. As the military started to realize the potential of the Automail, then the military application for this device started to surface itself. 
More for this gadget to be true is still far from our stand point but in every invention there is always two side accompanying one another.

Iron Man