For those not familiar with the object on the arm of the truck, that is a special device used to pierce a burning aircraft's skin, and inject water or other fire-suppression material inside the fuselage, without firemen hacking apart the skin with axes. Hacking the skin apart is not only exhausting work, and dangerous when an aircraft is burning, but opening a big hole in the skin of an aircraft can add oxygen to a fire. Not a good thing. That pointy rod pokes a small hole in the side, preventing oxygen from entering the inside of the aircraft and feeding the fire in the process.
