The next layer embodies the semi autonomous weapons which despite lifting some of the risk off the human operator, they can't assume full responsibility since the human operator still has the final say. Examples of those kind of weapons are the fire-and-forget air-to-air missiles or aircraft which automatically lock onto their targets. Pressing the button to launch such missiles is still the pilot's responsibility... Clearly the danger lurks in the third level, that of the fully autonomous robots where no human intervention is required. These robots are able to act on their own and accomplish their mission without the emotional burden or ethical reservations there to stop them.