Toxin Rebel
Toxin Rebels are armed with a rucksack full of toxic substances and can use chemical and biological weapons against enemy units, even if they are garrisoned in a fortified building.

C&C: Generals - Zero Hour
Dr Thrax bases his entire strategy on chemical and biological warfare. Each of his conventional units is replaced by a toxic variant, capable of causing long-term contamination of the battlefield, whilst his rocket weapon systems are systematically fitted with toxic warheads.
Toxin Rebels are armed with a rucksack full of toxic substances and can use chemical and biological weapons against enemy units, even if they are garrisoned in a fortified building.
The entrance to this type of Tunnel is protected by a biological weapon.
When tested, this third-generation biological agent proved to be even more lethal than Anthrax Beta.