Killer robots and a revolution in warfare

"Now programs with millions of lines of code are written by teams of programmers, none of whom knows the entire program; hence, no individual can predict the effect of a given command with absolute certainty since portions of programs may interact in unexpected, untested ways." That's what might have happened during an exercise in South Africa in 2007, when a robot anti-aircraft gun sprayed hundreds of rounds of cannon shell around its position, killing nine soldiers and injuring 14.