S.C. Code Ann. § 3-1-40

There is exempt from ad valorem taxation any real property, and improvements thereon, located within a military base or installation that is used or owned by the United States Armed Forces and is used as military housing for military-affiliated personnel and their families. Military housing includes ancillary facilities that support the military housing. This exemption continues to apply if the real property is improved, maintained, or leased to a party that would otherwise subject the real property to tax, so long as there is a contractual agreement by and between a branch of the United States Armed Forces and the lessee which requires the lessee to use the property for military housing.