They can only attack using their main gun, and move in straight lines, their thick armor meaning that they can take a beating before dying. Thus, these should be high on the priority list when encountered.
There are a few advantages the player has, however. First, the tanks move in straight lines and are relatively slow, meaning they can easily be maneuvered around. Second, Tanks take a few moments to line up their shot before firing, and this projectile can also be easily avoided, as it has a slow arc.
However, tanks are almost always supported by other monsters, usually Skeleton Soldiers.
They make further appearances in Painkiller: Battle out of Hell's level Leningrad, where they take on the form of Tiger and T-26 tanks, supported by German Soldiers and Russian Soldiers, respectively.
- The tanks that appear in Military Base appear to based on the M1 Abrams, which makes sense, given the setting of the level.