The right to any pension, allowance, or benefit; the right to the return of contributions; any optional benefit; or any other right accrued or accruing to any person under this chapter; and moneys under this chapter shall be exempt from any tax imposed by any state, county, municipal, or other political subdivision, except as provided in Code Section 48-7-27, and shall be exempt from levy and sale, garnishment, attachment, or any other process. Such funds and benefits shall not be assignable.