There are about one million public servants in Korea, 630,000 of whom are national public officials and 360,000 are local officials. Public servants are comprised of the following different categories: public officials in general service in charge of technology, research and administration; public officials in special service such as judges, prosecutors, teachers, police and fire-fighting officers; and public officials in political service who are elected officials or require the approval of the National Assembly to be appointed. In addition, different types of public officials are divided into different grades, and public officials in general service consist of the Senior Civil Service (SCS) and grades from 3 to 9.