Iowa Code § 97A.9
A member who is absent from duty as a peace officer while serving in the armed services of the United States or its allies and is discharged or separated from service in the armed forces under honorable conditions shall have the period of absence while serving in the armed services on other than a voluntary basis and one period of absence, not in excess of four years, while serving in the armed forces on a voluntary basis, included as part of the member's period of service in the department. The member is not required to continue the contributions required of the member under section 97A.8, during the period of military service, if the member, within one year after the member has been discharged or separated under honorable conditions from military service returns, and resumes the member's duties in the department, and if the member is declared physically capable to resume those duties upon examination by the medical board.
Iowa Code § 97A.9
88 Acts, ch 1242, §7