tsg provides support to regular divisional officers through high-visibility patrols, surveillance and decoy operations while also providing a presence on the streets. boroughs are also supported through the provision of a 'commissioner's reserve' a section of tsg that is on standby all year round; it is designed so such units are always available for rapid response of a sizeable number of officers anywhere within the metropolis to quell public order problems, from a bar brawl to large-scale public disorder. day to day tsg assist the boroughs in handling and relocating particularly violent prisoners.