Tamil Nadu Civil Service
Recruitment for the service is based on the results of an annual combined competitive examination.They hold a variety of posts at the sub-district level, delivering government services apart from revenue administration and the maintenance of law and order.Vacancies in the TNAS occur annually due to retirement and IAS promotion to the Revenue Administration Disaster Management and Mitigation Department.The Additional Chief Secretary (Commissioner) of Revenue Administration has authority over TNAS officers in training, appointment, promotion, posting and transfer and retirement.After the probationary period they are appointed deputy collectors, followed by district revenue officers after six years of experience.