(a) Any police officer in the classified service who, while so employed, is selected for unclassified service, is entitled to return to the classified service upon his termination from unclassified service within fifteen days after his written notice to the Director of Personnel of his intent to return to classified service; provided that such written notice is given to the Director within six months after such employee's termination from unclassified service. A police officer who elects to return to the classified service pursuant to this section shall retain the rights and privileges of his employment accrued prior to his unclassified service including, but not limited to, sick leave, annual leave, tenure, and rights to promotion. The employee shall be returned to the classified service in a position not less than the grade and position he held prior to his unclassified service.
(b) A peace officer, firefighter or corrections officer who accepts a position within the respective officer's department or in another department or agency of the Government which is in the unclassified service and which is higher in rank than the classified position, and who subsequently elects to return to classified rank of service must be given full credit for all the time served in the unclassified service, and the time served must be added to the prior time in the classified service for salary and seniority purposes.
(c) A peace officer who accepts a position in the executive security service and subsequently elects to return to classified rank of service must be given full credit for all the time served in the executive security service, and the time served must be added to prior time in the classified service for salary and seniority purposes.
(d) This section may not be construed as requiring the payment of any retroactive wages that might have accrued while the officer was serving in the unclassified service or the executive security service, as the case may be.