History of the Metropolitan Police Service been headed by a Commissioner, rather than a Chief Constable which is the highest rank in police forces outside London. The first Commissioners to hold the post were Lieutenant-Colonel Sir Charles Rowan and Sir Richard Mayne. When Sir Charles Rowan died, leaving Sir Richard Mayne as the surviving Commissioner, Captain William Hay was drafted in to jointly run the force with Mayne. However, because the two Commissioners did not agree on methods of running the force, since 1855 it was decided that only one Commissioner would run the force. Metropolitan Police patrols took to the streets on 29 September 1829,
Operation Trident (Metropolitan Police) Operation Trident (Metropolitan Police) Operation Trident, or simply Trident, is a Metropolitan Police Service unit originally set up in 1998 to tackle gun crime and homicide in London's Afro-Caribbean communities following a series of shootings in the London boroughs of Lambeth and Brent. By 2008 the unit was responsible for investigating "all" non-fatal shootings for "the Metropolitan Police" and in February 2012 the unit's remit was again expanded; the new Trident Gang Crime Command was launched incorporating responsibility for tackling wider gang crime. In 2013 the unit gave up responsibility for investigating fatal shootings which was taken over by the