When troops of the national guard are assigned to any state duty contemplated hereby, they shall act under the orders of the governor as commander in chief. Commanding officers of troops so employed are responsible only to their military superiors, and shall not act under, nor be subject to, the orders of any civil officer; they shall apply military tactics in respect to the manner in which they shall act to accomplish their missions, and shall use the minimum amount of force necessary to ensure the accomplishment thereof.