S.C. Code Ann. § 56-3-1815
The Department of Motor Vehicles may issue a special motor vehicle license plate to a retired member of the South Carolina National Guard and may issue a special motor vehicle license plate to a member of the South Carolina State Guard who is a resident of the State for a private passenger motor vehicle owned or leased by a member or a retiree only after the current stock of South Carolina Guard, National Guard, and South Carolina National Guard Retired license plates is exhausted. An application for a special motor vehicle license plate must include a copy of the applicant's military identification card or other evidence that shows the applicant is either a retired or active member of the South Carolina National Guard or the South Carolina State Guard.