During the three decades since Hiroshima and Nagasaki the ethical discussion of nuclear weapons has been preoccupied with the morality of using, or threatening to use, arms of mass annihilation. There has been a relative neglect of the ethics of nuclear arms control and disarmament. Moreover, since the late 1960's widespread complacency about the presumed efficacy of mutual deterrence and the ostensible progress of detente have tended to dissipate the nuclear anxieties of ethicists, politicians, and other citizens who attend to world affairs.