(a) The Department shall not be liable for any payment made from retirement benefits pursuant to a court order if such payment is made in accordance with the provisions of this chapter.

(b) In the event that the Secretary is served with more than one court order with respect to the same retirement benefits, the benefits shall be available to satisfy the court orders on a first-come, first-served basis.

(c) A previous spouse or other beneficiary may request that an amount be withheld from the retirement benefits of a principal or survivor of a principal which is less than the amount stipulated in a court order, or otherwise scheduled to be paid to the beneficiary under this chapter. This lower amount will be deemed a complete fulfillment of the obligation of the Department for the period in which the request is in effect. See § 19.14.