The flame tank version of the M4 Sherman, seen in the mission Relentless
A flame tank is a tank with a flamethrower instead of a main cannon. While near useless at long range, it makes up for it by devastating enemy forces at close range. Some flame tanks were able to project flaming gasoline up to 75m. They were used in WW2, but they were few and far between. They were extremely effective in the jungles of the Pacific, where they could set alight the vegetation. Flame tanks, and flame boats, were used in the jungles of Vietnam during the Vietnam War.
In Call of Duty: World at War
The flame tank seen in Relentless
The flame tank is first seen in the mission Relentless, and the player must support it by moving up with it. It is shown spraying enemy soldiers with its flamethrower, instantly killing them.
The flame tank is also present in Blood and Iron, but it is not a true flame tank, as it still retains its main cannon, the tank has what is more or less a 'coaxial flamethrower'.