19 Miss. Code. R. 101-1.10
Certifications issued by the MSCB shall remain valid for the life of the individual provided there is not a break in service with a fire service agency for a period greater than two (2) years.
In cases where a certified individual separates from a local fire-fighting unit and does not serve with a fire service agency within two (2) years but no more than five (5) years, the person would be eligible for recertification by completing the MSCB approved examination process including MSTAT. If a previously certified individual separates from a local fire-fighting unit and does not serve with a fire service agency for more than five (5) years, the person will be considered a new entry and required to meet all training and examination requirements established for minimum standards certification.
Certified Mississippi Fire Fighters called to active military duty by Presidential order for a period of time greater than two years shall not be considered to have a break in service provided the employer does not terminate the employee during the period of separation. The MSCB shall be notified of such circumstances by the employee's governing authority (i.e. human resource or personnel office) and be provided with official military documentation to validate the separation. Likewise, the MSCB shall be notified within 15 calendar days of an employee's completion of military duty.
19 Miss. Code. R. 101-1.10