Kan. Admin. Regs. § 80-3-12
An employee who returns from military service to the employment of a participating employer must provide the employer and retirement system with the original or a certified copy of his military discharge or separation papers within three months after his reemployment with said participating employer when it is his desire to claim his military service credit. In the event that such employee fails to file, within the time herein before prescribed, it shall be presumed he has waived service credit for the period of military service. However, if any person shall present evidence satisfactory to the board that his failure to file such military separation papers within said time period was due to lack of knowledge or incapacity on his part, said military service credit may be re-established at a later date.
Kan. Admin. Regs. § 80-3-12