27 Miss. Code. R. 210-16-101
The term "position" definition (p) of Section 12, and term "state service" definition (v) of Section 12 of Senate Bill No. 273, [now Miss. Code Ann. § 25-11-103(s)(1972, as amended)] relating to joint State and Federal agencies administering State and Federal funds, shall be interpreted to mean, when applied to "creditable service", service rendered by a person employed in a joint State - Federal Program financed jointly by State - Federal funds but which employees are not members of any other retirement system at the time they made claim for prior service; and provided that such employees are appointed to the position or positions involved by the State Agency, Political Subdivision or Municipality participating in the joint State - Federal Program.
27 Miss. Code. R. 210-16-101