Possibly one of the most notable FIUs is the Metropolitan Police's Operation Trident & Trafalgar, which initially only investigated gun crime involving the black community but has since expanded to investigate all shootings.
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Potential SFOs are also trained in safe entry into air and watercraft.
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Within London's Metropolitan Police, "authorised shots" were not completely phased out after the creation of AFO and SFO.
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In the Metropolitan Police the issue of firearms to stations was standardised with; ten pistols with 320 rounds of ammunition issued to divisional stations, six pistols with 192 rounds per sub-divisional station, and three pistols with 96 rounds to each section station.
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The Metropolitan Police was formed on the 29 September 1829, with the passing of the Metropolitan Police Act.
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Despite this, Home Secretary Sir Robert Peel gave the Commissioner authorisation to purchase fifty flintlock pocket pistols for use in exceptional circumstances.
Central processing unit | Law & Order: Special Victims Unit | The Unit | Bureau of Alcohol, Tobacco, Firearms and Explosives | Larissa (regional unit) | National Firearms Act | Economist Intelligence Unit | Diesel multiple unit | central processing unit | Company (military unit) | UNIT | unit | Chania (regional unit) | mya (unit) | diesel multiple unit | Trikala (regional unit) | G-Unit | Air Force Outstanding Unit Award | Navy Unit Commendation | Kastoria (regional unit) | Rethymno (regional unit) | Authorised Firearms Officer | 22nd Marine Expeditionary Unit | University Royal Naval Unit | Special Victims Unit | Meritorious Unit Commendation | memory management unit | Engine control unit | engine control unit | company (military unit) |
Outside of London, ARVs are controlled and organised by the Force Firearms Unit, and within the capital they are controlled by Specialist Firearms Command.