Mich. Comp. Laws § 35.461

Sec. 1. It shall be unlawful for any common carrier, inn-keeper or proprietor or lessee of any place of public amusement or entertainment, or any agent, servant or representative of any such common carrier, inn-keeper, proprietor or lessee as aforesaid, to debar from the full and equal enjoyment of the accommodations, advantages, facilities, or privileges of any public conveyance on land or water, or any inn or of any place of public amusement or entertainment any person in the military or naval service of the United States or of this state, wearing the uniform prescribed for him at that time or place by law, regulation, or the service or custom, on account of his wearing such uniform, or of his being in such service.