La. Stat. tit. 29 § 412
Any employee may, at his option, pay the required employee contributions to the retirement system, pension fund, or employee benefit plan applicable to his employment during his period of service in the uniformed services, provided the payment of contributions is permitted by the Internal Revenue Code if the plan is a qualified plan. The employee shall timely furnish his employer with sums equal to those that would have been deducted from his compensation for retirement system coverage, as required under the public retirement system or employee benefit plan. Upon such receipt, the employer shall remit the employee contributions to the applicable system or plan, including the employer contributions that would have been contributed on behalf of the employee. The employee shall notify his employer of his election to pay the required employee contributions to the applicable system or plan at the time he enters service in the uniformed services.
La. R.S. § 29:412