The X-47B, the Navy's prototype for an unmanned strike plane. The aircraft may eventually be able to set off on a flight plan, identify targets and fire weapons. Northrup Grunmman
Could We Trust Killer Robots? -- Wall Street Journal
A drone may never have a sense of morality, but it might perform better than a human soldier in sparing the innocent.
In the year 2015, somewhere over the tribal territories of Pakistan, an American MQ-9 Reaper drone patrols a complex "kill zone"—an area of terrorist activity in which large numbers of civilians are also present. But on this mission, the drone isn't piloted from afar. It's on its own.
The aircraft moves closer to gather information about a potential target. Infrared cameras, heat sensors and other tools of surveillance determine whether the target is indeed a militant, examining, for instance, whether he seems ready to attack. The drone's computer system ranks the suspect on a scale from -1 (a noncombatant) to +1 (a confirmed combatant). Having determined that no children or other civilians are in the vicinity, and that everything else is in order, it chooses a weapon and fires. It then assesses the damage and either fires again or, if the enemy is dead, continues its patrol.
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My Comment: Such weapon systems will perform according to what their designers plan .... so yes .... we can trust them .... but to a point .... more specifically .... those who program such systems are the ones who will be held accountable if things go wrong.