S.D. Codified Laws § 33-10-88

If a general court-martial, other than a general court-martial composed of a military judge only, is reduced below five members, the trial may not proceed unless the convening authority details new members sufficient in number to provide not less than the applicable minimum number of five members. The trial may proceed with the new members present after the recorded evidence previously introduced before the members of the court has been read to the court in the presence of the military judge, the accused, and counsel for both sides.