Miss. Code Ann. § 21-29-131

The Public Employees’ Retirement System shall keep a record of service of the members of said fire department and police department, which record shall show the history of employment of each member of said fire department and police department. Said record shall be entered up fully at the time such city comes within the terms of this article, and it shall thereafter be kept entered up fully and correctly. All records currently maintained by the municipality’s affected membership shall be forwarded to the Public Employees’ Retirement System not later than July 1, 1987. Any additional changes shall be forwarded to the Public Employees’ Retirement System as made.