They wear a FAST helmet with a visor and headphones, and a balaclavas. UIU Troopers wear green uniforms with several accessories such as armor vests and knee pads. They can spawn as a UIU Trooper, UIU Agent, or UIU Leader. The UIU spawn location is at Gate B in the same location as the MTF in Containment Breach and Team Deathmatch rounds.

They are neutral to Class-D, unlike most Foundation personnel besides Facility Personnel. The UIU's objective is to assist Foundation personnel, and eliminate any hostile G.O.I.s and SCPs. Because of this, the UIU are heavily under-equipped and under-prepared for anomalous threats, and mainly deal with minor anomalies and to 'assist' the SCP Foundation and GOC. They are heavily underfunded, however, as the US government puts their funds towards the SCP Foundation and GOC. The Unusual Incidents Unit is a secretive branch of the Federal Bureau of Investigation (FBI) that is tasked with protecting the United States from anomalies and associated groups, similar to the goals of the SCP Foundation and Global Occult Coalition.

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