(I) An engineer may choose either to work or not to work in defense-related industries and be ethically justified in either position. (II) Many reasonable engineering professionals feel that, ethically, they cannot work on designs that will ultimately be used to kill other humans. (III) Their remoteness from the actual killing doesn't change this feeling. (IV) Everyone in his working life is likely to face problems that cannot be solved easily. (V) Even though they won't push the button or may never actually see the victims of the weapon, they still find it morally unacceptable to work on such systems.