(a) The appointment or designation of any police officer or officers under the authority of this subchapter shall not be deemed to supersede in any way the present authority of the Department of Arkansas State Police, that of the county sheriffs, or that of the peace officers of the jurisdiction in which the military reservation or portions thereof shall be located and on other real property that has all of the following characteristics:
(1) Adjoins a military reservation;
(2) Is owned, leased, or otherwise under the legal control of an instrumentality of the United States or an instrumentality of the State of Arkansas; and
(3) Is real property upon which the Adjutant General has undertaken to provide police or security services.
(b) None of the present jurisdiction or powers of the county sheriffs or the department shall be ceded to the police officers or over the land or property or persons on the land.