Technological developments have enabled the evolution of warfare from cavemen bludgeoning each other with blunt objects to career soldiers detonating explosives from miles away. What's next on the battlefields of the future? Military robots are rolling, flying, and swimming into conflict zones, aiding and protecting their human counterparts. We take a closer look at these robo-warriors in our new series, "Military Robots."Continued in Part 2, "Soldiers and Their Bots."