Cal. Gov. Code § 19200

Whenever the United States is engaged in war or whenever the department finds that an emergency exists in connection with the national defense, the department may authorize duration examinations and employments in those classes in which the best interests of the state would be served during such war or emergency. Within not less than three months, or more than one year, after the department finds that there is no longer an emergency, all duration employments shall be terminated in such order as the department deems appropriate.