Airwolfs control stick has two buttons controlled by the thumb: On the left side to enable "turbos", on the top to fire a missile. Throughout season 3 Hawke and Dominic sometimes press the top "missile" button to engage turbos.
Throughout the series, Airwolf is shown launching various missiles from three small tubes under the helicopter. These include the Copperhead (6 inch diameter x 54 inch length), Harpoon (13.5 inch diameter x 12.5 feet length), Hellfire (7 inch diameter x 64 inch length), and Maverick (12 inch diameter x 8 feet length). None of these missiles are small enough to fit into the tubes shown. All of the air-launched variants were mounted on hardpoints on the wings. The Copperhead was never used by aircraft, it is launched by artillery.