Army Reserve Staff Sgt. Alfredo De Los Santos wears the X2 microprocessor knee prosthetic. The X2 contains gyroscopes, accelerators and hydraulics to give the wearer greater stability, mobility and versatility. Like the BiOM, the X2 intuits the the movement of its wearer and adapts accordingly. The knee is the result of a program funded in support of the Military Amputee Research Program. (image via U.S. Army)