M2-2
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The M2-2 was a man-portable backpack flamethrower that was used in World War II. Although its actual "burn time" was around 7 seconds and the flame was only effective out to around 33 meters, it was still a decent weapon that had great uses in the war. However, with the later arrival of tanks and, especially, flamethrower tanks, the need for infantrymen to expose themselves to fire became unnecessary as tanks offered greater protection while still delivering the effective damage. As some were sold off, the majority of them were also scrapped when they were declared "obsolete."