North Dakota Constitution Art. XI, § 16

The reserve militia of this state consists of all able-bodied individuals eighteen years of age and older residing in the state, unless exempted by the laws of the United States or of this state. The active militia is the national guard of this state and consists of individuals who volunteer and are accepted unless exempted by the laws of the United States or of this state. An individual whose religious tenets or conscientious scruples forbid that individual to bear arms may not be compelled to do so in times of peace, but that individual shall pay an equivalent for a personal service.