§ 4. Equality of treatment and opportunity. It is hereby declared to be the policy of the state that there shall be an equality of treatment and opportunity for all persons in the organized militia without regard to race, creed, color, national origin or sex. Such policy shall be put into effect by regulations to be issued pursuant to section three of this chapter, it being necessary to give due regard to the powers of the United States which are or may be exercised over the militia of the state.