Idaho Code § 46-802
No body of men, other than the regularly organized national guard, the unorganized militia when called into service of the state, or of the United States, and except such as are regularly recognized and provided for by the laws of the state of Idaho and of the United States, shall associate themselves together as a military company or organization, or parade in public with firearms in any city or town of this state.
No city or town shall raise or appropriate any money toward arming or equipping, uniforming, or in any other way supporting, sustaining or providing drill rooms or armories for any such body of men; but associations wholly composed of soldiers honorably discharged from the service of the United States or members of the orders of Sons of Veterans, or of the Boy Scouts, may parade in public with firearms on Memorial Day or upon the reception of any regiment or companies of soldiers returning from such service, and for the purpose of escort duty at the burial of deceased soldiers; and students in educational institutions where military science is taught as a prescribed part of the course of instruction, may with the consent of the governor, drill and parade with firearms in public, under the superintendence of their teachers. This section shall not be construed to prevent any other organization authorized by law parading with firearms, nor to prevent parades by the national guard of any other state or territory.
Idaho Code § 46-802