All managers must be aware of the ethical issues and conflicts in their respective spheres of influence in the workplace, because the enterprise depends on their abilities to resolve such issues. Some ethical conflicts may arise when work duties clash with the beliefs of conscience of individual employees. Potential conflicts could arise from the prior acceptance of a policy that had been a condition of employment. In the 1950s, 1960s, and 1970s, all employees of nuclear weapons laboratories in the United States were required to state their willingness to accept assignments in a weapons design division should the Nation require their service. Not all applicants were willing to accept that condition.