S.C. Code Ann. § 25-1-3130: Oath of Witnesses.

All persons who give evidence before a court-martial must be examined on oath or affirmation administered by the trial counsel in the following form: "Do you swear (or affirm) that the evidence you shall give in the case now in hearing shall be the truth, the whole truth, and nothing but the truth. So help you God." In case of affirmation the closing sentence of adjuration may be omitted.