Mo. Rev. Stat. § 41.750: Campground or armory — intrusion — penalty.

The commanding officer or his representative may place under arrest any person who trespasses upon any campground, parade ground, field exercise, armory or other place devoted to militia duty, or who in any way or manner interrupts or molests the orderly discharge of militia duty, or who disturbs or prevents the passage of troops going to or returning from any duty. Any person committing such offense is guilty of a misdemeanor and, if arrested, shall be delivered to the civil authorities for trial.