In the past decade, research on the philosophy and the development of artificial moral agents (AMAs) have increased in order to seek for the implementation of moral decision-making faculties basically in machines—computers, robots, etc. Because of this, ethical reasoning becomes one of the primary challenges computer scientists, engineers, and philosophers are trying to solve—by developing an ethical dimension that can be incorporated in a machine so that it can make decisions on its own subjected to ethical and morality issues. However, when this ethical dimension is implemented in autonomous weapon systems (AWSs) such as cruise missiles, torpedoes, uninhabited/unmanned aerial vehicles (UAVs) and uninhabited/unmanned combat aerial vehicles (UCAVs), difficulty and confusion arise due to the question of who should hold responsible when the AWS itself is involved in an atrocity that would normally be described as a war crime under the principle of jus in bello—rules concerning acceptable practices while engaged in war. Thus, this paper presents a solution to the problem which is by incorporating artificial morality into the AWSs making them AMAs. Literatures supporting the possibility of incorporating an ethical dimension that is able to consider moral principles to be applied in AWSs are also presented.