O.C.G.A. § 38-2-1036

Pretrial, trial, and post-trial procedures, including, but not limited to, modes of proof, for courts-martial cases arising under this article and for courts of inquiry shall be prescribed by the Governor, or the adjutant general by delegation of the Governor, by regulations issued pursuant to Part 1 of Article 2 of this chapter, or as otherwise provided by law, which shall apply the principles of law generally recognized in military criminal cases in the courts of the armed forces but which may not be contrary to or inconsistent with this article.