The M2 Flamethrower is an American flamethrower used in World War II, the Korean War, and the Vietnam War. It was an improved version of the M1 and M1A1 flamethrowers, which had some problems with reliability and performance. The M2 has a burn time of around 7 seconds and a range of 20 to 40 meters. It uses two tanks of napalm fuel, and one tank of nitrogen propellant. There is a trigger to fire the flame and an igniter to light it. The M2 is effective against fortified and entrenched enemy positions, but is also a powerful psychological weapon, as fire could cause fear and panic among the enemy. However, the M2 is also dangerous to use, as it can malfunction, leak, or explode, besides being too heavy and bulky to carry around and manoeuvre like a gun. Its most modern variant, the M9A1-7, has become an icon of the Vietnam War, being lighter and easier to use than its predecessors.