Koch is a named sentry bot who would have appeared in Vault 22 at one point, broken.
There are scripts relating to a cut mini-quest to repair it. It is placed in the Vault 22 Common Areas, but disabled.
The sentry bot Koch (V22Koch) is found further down, in the areas where the spore creatures first appear. He (in fact Koch's scripts refer to the robot as both male AND female) is present in the final game, but disabled. When the player encounters him he is broken, and can be fixed with a repair skill check. Koch's a real mess; the value used for the skill check to repair him is inconsistent between what is told to the player (repair 40) in the messages displayed when examining him, and the actual value checked in the script (repair 60). Once the player gets him working again, further bugs appear. He is "dead" on first being discovered, and when resurrected the following command is used: 'V22KochREF.resurrect 1'. This resurrects a dead actor and makes them use an animation to get up again. This argument (the number 1 at the end) is useless on sentry bots as they have no "get up" animation. This would be fine but for the fact that it also causes a weird as hell bug - Koch will literally fall apart randomly once revived this way. A strange animation bug kicks in and his model's parts collapse into a heap on the floor, only to leap back into place again. Instead V22KochREF.resurrect 0 should have been used. Even then this results in him weirdly falling out of the sky on revival due to how the game engine works. Once revived the player is then told Koch cannot move due to being damaged. This makes him completely useless, as combat is his only function and up here there are no enemies. Furthermore he is part of the generic "robotfaction" which is actually allied to the spore creatures, and will attack the player if they are in combat with the spore creatures in his presence.
Behind the scenes
The name of this robot is a reference to the scientist named Robert Koch.