S.C. Code Ann. § 25-1-2800

Under such instructions as the adjutant general may prescribe, a sentence of confinement adjudged by a court-martial, whether or not the sentence includes discharge or dismissal, and whether or not the discharge or dismissal has been executed, may be carried into execution by confinement in any place of confinement under the control of the federal armed forces, the state military forces or in any penal or correctional institution, detention facility, jail, or stockade under the control of the State or a political subdivision of it, or which the State or a political subdivision of it may be allowed to use. Persons so confined in a penal or correctional institution not under the control of the military forces are subject to the same discipline and treatment as persons confined or committed by the courts of the State. The omission of the words "hard labor" from any sentence or punishment of a court-martial adjudging confinement does not deprive the authority executing that sentence or punishment of the power to require hard labor as a part of the punishment.