Del. Code tit. 21 § 2117
Upon the surrender to the Department of the number plates or plate issued for a vehicle registered under this title, and the furnishing of proof satisfactory to the Secretary and the State Treasurer that (1) the owner of the vehicle entered the armed forces of the United States after such vehicle was registered or (2) that the owner of such vehicle is 65 years of age or older and that the owner voluntarily surrendered such owner's operator's license following the attainment of such age and the registration or reregistration of such vehicle, and that the registration of such vehicle is in full effect, there shall be refunded to such owner, from the General Fund of this State, from funds not otherwise appropriated, a sum equal to as many twelfths of the fee paid for the registration of the vehicle as there are full calendar months in the registration year following the date of the receipt of the number plates or plate, less the sum of $1.
21 Del. C. § 2117