Battle Tanks 

Squads of kamikaze troops are forced volunteers and are usually have-to-be-well-trained immigrants and emigrants.  Every trooper is given a bomb with cumulative effect and helmet.  The wrecker sneaks to the target and activates the detonator.  The most dangerous is helmet: it is thrown by force of explosion with a great power and can even damage armor of tank.  If another kamikaze is within range of that blast, he will explode as well.  A chain explosion of kamikazes is beautiful night show.

Machinegun towers guard important objects (such as dining tents of officers, first of all) and for watching over back-and-forth motions of the enemy.  Towers can be destroyed by hitting their legs.  After the leg is damaged enough, the tower crashes, the machinegunner breaks his legs and quickly gets bored to death.

This is the same MG tower but the soldier is equipped with a missile launcher instead of machinegun.  The soldier is also given a piece of bacon for greezing the barrel and a bottle of whiskey for cleaning the aiming optics.

Experienced soldiers unmount guns from damaged tanks and build stationary artillery sites.  This is quite effective for defense.

Cruel hellish experiments performed by military scientists on those people who violated copyrights resulted in dramatic and fearful mutations of them.  Both exterior and brain activity have been affected, and internal is also not the same.  For example, zombies can only breath by genetically modified air, and they drop eggs each night.  But even after all these changes they are still human beings and keep some old habits: on Christmas and New Year, they wear red coats and crave for kissing everybody.

Acid (and alkaline) slimes hatch from eggs dropped by zobmies.  These creatures are loathsome and unscrupulous, they simply spit on everyone in their sight.  Their poisoned spittle slows, damages and demoralizes the victim.  Acid slimes often assist zombies, and vice versa.

Brought from Astaxis planet, the Hey Xoolood sand worm has found its ecological niche: the population of sand worms grows. But it cannot be tamed because of its low IQ, and it is always hungry, so it attacks and tries to swallow everything. Its terrible jaws can crash and grind everything, even armor of heavy tank. The only weapon that may damage this hell creature is bad food. Therefore, seek for mortar if you want to kill sand worm.