Raytheon's XOS 2 has a right hook that can rip straight through a wall, but its master -- Dr. Fraser Smith -- assures us that death-dealing variants are still a good ways off. We caught up with the good doctor earlier today, who's been working on the military-grade exoskeleton for eight years, and quizzed him on the hows and whys of building a would-be Iron Man. Find out what we learned after the break, and see the mean machine in our gallery below! Gallery: Raytheon Sarcos XOS 2 exoskeleton - press pics