Cal. Military and Veterans Code § 398

Any person who trespasses upon any campground, armory, airport, or other place devoted to military duty, or who in any way or manner interrupts or molests the orderly discharge of military duty, or who disturbs or prevents the passage of troops going to or returning from any duty is guilty of a misdemeanor and may be placed under arrest by or at the direction of the commanding officer of the troops or of the place concerned. The Adjutant General may cause any place to be declared “off limits” to members of the National Guard if necessary to protect the health, safety, morals or general welfare of such members during such times as the National Guard may be on active duty or in attendance at an encampment, maneuvers or extended exercise.