STAG is deployed to Steelport following a devastating attack on the Hughes Memorial Bridge in Stilwater, perpetrated by the Luchadores. STAG has their own, unique arsenal of futuristic weapons and vehicles.
It operates under the control and supervision of the United States Government, and acts as a replacement for the SNG at higher Notoriety levels, although the Steelport Police and a minor SWAT presence still remain. STAG, short for Special Tactical Anti-Gang Unit, is a technologically-advanced paramilitary force lead by Commander Cyrus Temple and his subordinate, Kia.