Second Variety by Philip K. Dick 2

In the aftermath of a devastating nuclear war between the United Nations and the Soviet Union, sophisticated robots, nicknamed “claws”, are created to destroy what remains of human life. Left to their own devices, however, the claws develop robots of their own. II-V, the second variety, remains unknown to the few humans left on Earth. Or does it?
Second Variety was adapted into the film Screamers.............................................