Wis. Stat. § 321.37

No person, otherwise qualified, may be denied membership in the national guard or state defense force because of sex, color, race, creed, or sexual orientation and no member of the national guard or state defense force may be segregated within the national guard or state defense force on the basis of sex, color, race, creed, or sexual orientation. Nothing in this section prohibits separate facilities for persons of different sexes with regard to dormitory accommodations, toilets, showers, saunas, and dressing rooms.