51 Pa.C.S. § 1104

The composition of all units of the Pennsylvania National Guard, including the commissioned and enlisted personnel thereof other than those specifically provided for in this chapter, shall be fixed from time to time by the Governor and announced in orders, and shall, as far as practicable, be in accordance and in compliance with such regulations as may be promulgated by the Secretary of the Army and Secretary of the Air Force for the composition of the National Guard. Every such order shall have the same force and effect as if specifically enacted and provided for by statute.