Dienst Speciale Interventies

DSI (Dienst Speciale Interventies; Special Interventions Service) is the elite police tactical unit of the Dutch National Police Corps. In total, the DSI consists of about 450 people, both police officers and military personnel. The unit is unique in that it is a mixed unit consisting of both law enforcement and military personnel. Its main tasks are neutralizing terror threats, arresting armed suspects. Since 2013 the regular ATs (Arrestatieteams; Arrest Teams) are part of the DSI as well.

History
The DSI was established in 2006 in order to improve the joint deployments of the several police tactical units. Points of improvement became apparent after the problematic siege of a house in The Hague which was part of operations aimed at the arrest of terrorists belonging to the Hofstad Network. In 2006 the unit was formally established and was at that time part of the KLPD.

With the establishment of the National Police Corps in 2013 the regular Arrest Teams were placed under the command of the DSI.

Organisation
The DSI consist of four units:
 * Unit Arrest Teams (Afdeling AOT's): the Arrest Teams are mainly deployed for the arrest of armed suspects and other life threatening situations. Furthermore, the unit deploys Rapid Response Teams (RRTs); unmarked police cars surveil cities to quickly be on scene at the event of a possible terror attack. The Netherlands are divided in 6 AT-regions. Additionally, the arrest team of the Brigade Speciale Beveiligingsopdrachten partakes in these operations as well.
 * Unit Intervention (Afdeling Interventie): the main tasks of this unit are the arrest of terror suspects and the neutralisation of ongoing terror attacks. The unit consists of both law enforcement and military personnel. Personnel gets detached to Unit Intervention for a certain amount of time and then returns to their respective unit. The unit is comprised of approximately one third M-Squadron operators, one third AT operators of the BSB and one third AT operators of the police.
 * Unit Expertise and Operational Support (Afdeling Expertise & Operationele Ondersteuning): this unit provides operational support to the various units of the DSI. This includes police negotiators, snipers and support with drones.
 * M-Squadron: M-Squadron is part of NLMARSOF of the Netherlands Marine Corps and is formally not part of the DSI. However, during national deployments M-Squadron operates under the command of the DSI. M-Squadron is specialised in complex interventions, for example interventions on ships and oil rigs.

Weapons
Weapons in use include, among others:
 * Glock 17
 * FN P90
 * Heckler & Koch MP5
 * Heckler & Koch MP7
 * Heckler & Koch HK416
 * Heckler & Koch HK417
 * SIG MCX
 * Milkor MGL