The M2 flamethrower (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 functional
weapon that had many 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.