As of today military widely uses drones for conducting surveillance, attack hostile target, spot submarines and mines. With advantages like being smaller and stealthier these drones have been also found successful in delivering humanitarian aid to distant places. As it is distantly controlled the safety of the pilot is also enhanced.
Though this fact doesn’t thrill many people, owing to the possibility of killing, damaging or destroying autonomously. A huge list of people have written an open letter to UN (United Nations) to crease the use of these weapons as it’s not clear how and where human intervention or approval is sought by the machine. The human intellect can’t be fully replaced by these machines.