(a) Except as provided by Subsections (b) and (c), service credit transferred under this chapter is credited in the system to which it is transferred according to rules of the teacher retirement system determining the amount of service creditable.
(b) Not more than one month of service credit may be granted for service during that month.

(c) A person who transfers service credit under this chapter may not receive service credit for all military service performed in an amount that exceeds the maximum amount creditable in the system to which credit is transferred. A person is eligible for a refund from the system from which credit is transferred under this section of contributions made for military service credit, other than any amount that represents a fee, that exceeds the maximum amount creditable.