Any corps of artillery, cavalry, or infantry existing in the State on the passage of the act of Congress of May 8, 1792, which by the laws, customs, or usages of the State has been in continuous existence since the passage of that act, under its provisions and under the provisions of section 232 and sections 1625 to 1660, both inclusive, of Title 16 of the revised statutes of 1873 and the act of Congress of January 21, 1903, relating to the militia, shall be allowed to retain its ancient privileges, subject, nevertheless, to all duties required by law of the militia; but these organizations may be a part of the North Carolina National Guard, and entitled to all the privileges of this Chapter, and shall conform in all respects to the organization, discipline, and training of the North Carolina National Guard in time of war. For purposes of training and when on active duty in the service of the United States they may be assigned to higher units, as the President may direct, and shall be subject to the orders of officers under whom they shall be serving. (1917, c. 200, s. 87; C.S., s. 6798; 1975, c. 604, s. 2; 2009-281, s. 1; 2011-195, s. 1(a).)