What does the State Constitution say? Can they force people to buy anything?
Come now. Does what any old must document say truly matter? It’s for the common good, don’cha know.
State governments, unlike the federal government, are not limited to the US federal enumerated powers ?
ARTICLE XV — MILITIA
§ 1. Composition of militia.
The militia of the state of South Dakota shall consist of all able-bodied male persons residing in the state, between the ages of eighteen and forty-five years, except such persons as now are, or hereafter may be, exempted by the laws of the United States or of this state.
§ 2. Legislative provisions for militia.
THE LEGISLATURE SHALL PROVIDE BY LAW FOR THE enrollment, uniforming, EQUIPMENT and discipline OF THE MILITIA and the establishment of volunteer and such other organizations or both, as may be deemed necessary for the protection of the state, the preservation of order and the efficiency and good of the service.
[...]
§ 7. Conscientious objectors.
No person having conscientious scruples against bearing arms shall be compelled to do military duty IN TIME OF PEACE.
{IIRC we are still technically at war w/ N. Korea, so being a “conscientious objector” is not an excuse... possibly being female would be.}