Morality in a Time of War

What is the role of the scientist in a time of war? Frayn appears to ask this question in Copenhagen. Is it the scientist's duty to use the results of the most recent and significant research to help to protect his or her homeland, even if it means the destruction of thousands of lives? Or does a scientist have a moral obligation to use his research to improve life on this planet? Who made the better decision between Bohr and Heisenberg? Was it Bohr, when he helped create the atom bomb, thus saving the world from several cruel dictators, despite the cost to Japan? Or did Heisenberg make a better moral decision, if in fact he did thwart the creation of an atomic bomb and thus disallowed the Nazis the upper hand in World War II? Can one even talk in terms of...