S.C. Code Ann. § 25-1-640: Date of rank of certain former military officers.

Notwithstanding any other provision of law, former Regular and Reserve officers in any component of the Armed Forces appointed and commissioned in the South Carolina Army National Guard and former Regular and Reserve officers in any component of the Armed Forces appointed and commissioned in the South Carolina Air National Guard in the rank of captain, or first and second lieutenant shall be given a date of rank commensurate with their Regular or Reserve officer date of rank.