The majority of UK Police Forces use Mercedes-Benz Sprinter vans, commonly referred to as 'Carriers', as standard transport for PSUs. A notable exception is the Police Service of Northern Ireland, whose Tactical Support Group officers famously use armoured Land Rovers. These vehicles are equipped with mesh window shields and/or high-impact-resistant polycarbonate windscreens and outfitted with storage compartments for officers' riot control equipment as well as Method of Entry and CBRN kit. Carrier drivers must undergo specialist driver training in 'riot conditions' before qualifying as a carrier driver. The Metropolitan Police's Territorial Support Group also maintains a fleet of armoured Ford F450 based Jankel Guardians for use in serious public order situations, like the 2011 England riots. These are identical to, and interchangeable with, the Guardians used by SCO18 Aviation Command and SCO19 Firearms Command.