The Cohesion configuration is designated as a "Suppression" tank. For the Cybertanks, this qualifies as a dedicated anti-infantry vehicle. As the Cybertanks are simply too big to fit inside buildings (and rarely feel the need to try and capture anything anyway), the Cybertanks solution to the problem of infantry is the most basic - obliterate the place the infantry are standing in.
The Cohesion's primary weapon is a cannon that fires a minaturised matterflux shell. This is capable of inflicting vast amounts of damage to structures, plant-life and and vehicle unfortunate enough to be hit by it.
Interestingly, dead Cohesions have revealed that the design of these shells indicates they have been replicated from the starship technology principles, as opposed to the Cybertank's natural technology. Indeed, old records from early encounters indicate that the shells were a high-explosive weapon, whose design was entirely consist with the internal workings of the Cybertanks.