S.C. Code Ann. § 1-3-50

Whenever the Governor shall desire the attendance of a personal staff upon any ceremonial occasion he shall detail therefor such officers as he may choose from the active list of the National Guard of South Carolina, resident in or nearest to the place where such ceremonies are to be held, and the officers detailed shall attend in uniform at the time and place designated and shall constitute the personal staff of the Governor for that occasion, reverting upon completion of such duty to their regular assignments. The Governor may appoint as his military secretary any officer of the United States Army detailed for duty with the militia of this State, and such officer shall have the rank of colonel and the title "Military Secretary to the Governor".