Members of the Army or Air National Guard who have been qualified by training and are authorized by their commanders may use electric guns, as specifically provided in section 134-G, when assisting civil authorities in disaster relief, emergency management, or law enforcement functions; provided that “training” for the purposes of this section means a course of instruction or training in the use of any electric gun authorized pursuant to this section, that is provided or authorized by the manufacturer or is manufacturer-approved or is an electric gun training program approved by the Army or Air National Guard, before deployment or issuance of electric guns and related equipment.