Philip K. Dick: Fallout
It's the 1980s and nuclear war between the US and the Soviet Union has forced humanity into bunkers, scorching the planet and leaving only the Leadys, the semi-sentient robot fighters, to continue to wage the war above against other Leadys.
The humans below, however, think that their Leadys might have other motives...
--
Adapted from "The Defenders" by Philip K. Dick.