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The M2 Flamethrower was a piece of junk that the Americans used in WWII. It was so awesome that it got a spot in Call of Duty: World at War, and it is the best thing ever in Nazi Zombies.
I died five times trying to use the M2 in campaign mode. It was worth it.
My friend got the M2 in multiplayer and roasted my squad like they were chicken wings.
I saw a Nazi get hit by the M2 and screamed like a baby.