Security-2-Bot

The Security-2-Bot or Security-2 Robot is an enemy encountered in System Shock.

Overview
"Like a walking tank, this heavily-armed and armored sentinel will be found protecting the highest-security stations against attack. Two Gatling-style cannons and three mounted 20mm guns make this robot a perfect combat machine."

- Catalog of Robotic Assistants on Citadel Station

Security-2 Robots are robots tasked with being part of Citadel Station's security. 

Strategy
The strategy for these enemies is very similar to those of the Security-1 Bots, and as such they can be seen as upgraded versions of them.