DuVall believes he has a legal obligation to resist planning and preparation for nuclear war taking place at Büchel NATO base, a violation of international laws and a crime according to the Nuremberg Charter and Principles.
Not exactly true.
Preparation for attack is a serious crime (not only in international law, also in German law), preparation for defense is not.
Therefore he needs to be precise and specific, and it would be good to have more than just his own belief. Just a tiny little more...