Miss. Code Ann. § 33-1-33

(1) The civilian guards employed by the military department, whether paid by state appropriations, federal funds, or other authorized funds, or any combination thereof, and assigned to duties of safeguarding personal and real property belonging to the state or United States or government mixed properties or personal properties belonging to officers and men of the National Guard or of the employees of the military department are hereby given peace officer powers of a constable on the military facilities and reservations to which such civilian guards are assigned.

(2) During periods of annual training, the Adjutant General may designate personnel of military police units to have peace officer powers of a constable on all military facilities, airfields, or reservations belonging to the Mississippi National Guard including, but not limited to, Camp McCain, Grenada, Mississippi, Camp Shelby, Hattiesburg, Mississippi, and the Air National Guard Training Site, Gulfport, Mississippi, Key Field, Meridian, Mississippi, Thompson Field, Jackson, Mississippi, and Hawkins Field, Jackson, Mississippi, to supplement the civilian guards in subsection (1) above.

(3) The Adjutant General may designate civilian guard employee duties to be of such a nature as to require the employee to meet the requirements established by the Board on Law Enforcement Officer Standards and Training for law enforcement officers. For purposes of enforcement, these civilian guard employees shall have the powers of law enforcement officers on the military facilities and reservations to which assigned. The Adjutant General, Mississippi Military Department, the Mississippi National Guard and any designated civilian guard employee including, but not limited to, peace officers and armed or unarmed civilian guards, shall have discretion in the performance of their duties and shall be immune from liability as provided for in Section 11-46-1 et seq. Monies from the State General Fund may be utilized for the training of these officers at the Mississippi Law Enforcement Officers' Training Academy.