Class-D's, also known as Class-D Personnel, D's, and D-Classes, are the primary enemy force of SCP: Containment Breach Nine Tailed Fox Mod.
They are the unwilling, expendable servants of the SCP Foundation, mostly composed of death row inmates. The original SCP - Containment Breach had the player control a defenseless one designated D-9341.
Class-D's are stationed in random parts of the map, and are armed with handguns that can bring the player's health down in a few shots. They are quite durable, but will eventually go down after absorbing enough gunfire from either the player, or the two other Nine Tailed Fox operatives.