The cruise missile and the neutron bomb, two weapons recently developed in this country, have sharpened both military and moral questions. Neither weapon is radically new; the German V-l “buzz bomb” of World War II was a primitive cruise missile, and the neutron bomb is a further development in the line of fission and fusion warheads dating from World War II. Nevertheless, on the basis of information made public about the new weapons, they appear to differ fundamentally from their antecedents. It is necessary to ask about the moral relevance of these differences.