Sec. 2. The militia shall be divided into two (2) classes, the sedentary militia and the national guard, as follows:
(1) The sedentary militia consists of all persons subject to bear arms under the Constitution of the State of Indiana who do not belong to the national guard.
(2) The national guard consists of those able-bodied citizens between the proper ages as established by this article who may be enrolled, organized, and mustered into the service of the state as provided in this article. The organized militia of the state constitutes and shall be known as the Indiana national guard.