Up until sometime back, killer robots were nothing but a sci-fi concept, but now robots are an important part of the Iraq war, helping soldiers carry out their missions with added efficiency.

If things keep going the way they are, by the time the 21st century rolls in, robots have good chances of becoming the dominant method of war for rich countries.

When America first invaded Iraq in 2003, there were no robots serving as a part of the military force. By the time 2005 had rolled in, however, there were 2400 of them, and as of now, there are about 12,000 of these machines, which carry out 33,000 missions every year.

As has been shared in a report by the US Joint Forces Command, autonomous robots will become "the norm on the battlefield within 20 years".

"They're not afraid. They don't forget their orders. They don't care if the guy next to them has been shot. Will they do a better job than humans? Yes", said Gordon Johnson of the Pentagon's Joint Forces Command, while stressing that warbots are a safer model of combat.