Unless otherwise expressly provided, the National Guard in this state shall be governed by the laws, rules and regulations of the United States for governing the National Guard, provided the National Guard in this state shall receive aid and support from the United States and, if such aid or support is withdrawn or if the Congress of the United States repeals all legislation relating to the National Guard, leaving to this state the duty to provide for and maintain, without federal aid or control, its own military forces, then the National Guard of this state shall be organized, trained, disciplined and governed, its officers appointed, commissioned and promoted and its enlisted personnel enlisted and discharged in such manner as may be prescribed by the Adjutant General in regulations and general orders approved by the Governor, until the General Assembly makes provision therefor.