Security Department, SCP Foundation Wikia

The Security Department (SD) is a division of the SCP Foundation, consisting of agents tasked with guarding the Foundation's secret bases and containment facilities. Their job duties include preventing containment breaches (SCPs escaping from the site), keeping D-class personnel under control and forcing them to cooperate in laboratory experiments, and defending the site from external attacks by hostile forces (whether that be an enemy Group of Interest or something more anomalous).

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SCP Foundation (Website) - TV Tropes

Security Department, SCP Foundation Wikia

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The SCP Foundation

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Security Department, SCP Database Wiki

Personnel Classification (Class A to C out of 5 classes) in the

SCP - Containment Breach

Foundation Departments - SCP Foundation