Joint Rapid Reaction Force

The Joint Rapid Reaction Force (JRRF) is a formation of the British Armed Forces; it consists of a pool of specialised units from all three armed services tasked with rapid deployment worldwide at short notice. The force is intended to be capable of mounting operations up to medium scale warfighting. It can be employed nationally, or multinationally under the auspices of NATO, the European Union, the United Nations or any other coalition.

History
The JRRF was an initiative in the 1998 Strategic Defence Review. An initial rapid reaction capability was declared in April 1999 and was fully operational in 2001. It was originally intended that JRRF would be able to mount up to two simultaneous operations of up to 15,000 personnel each. A major military exercise called Saif Sareea II was held in Oman in September 2001 to test the deployment of the JRRF.

Command
In the event of the JRRF being activated, the force commander is the Chief of the Joint Rapid Reaction Force (CJRRFO) who is responsible to the Chief of Joint Operations (CJO) at the Permanent Joint Headquarters at Northwood. A Joint Task Force HQ (JTFHQ) would accompany the force to provide local command, which is maintained at 48 hours notice to move. Until deployed, operational control of the various units is the responsibility of the single-service Commanders-in-Chief.

Forces
The Joint Rapid Reaction Force can be deployed in three phases. The first element is known as the Spearhead Forces that are kept at a high state of readiness. This is composed of Following that, if required, is the First Echelon, composed of
 * The Spearhead Land Element (SLE) of special forces (SAS or SBS), and either a light infantry battalion or a commando group.
 * The Spearhead Naval Force (SNF) of two frigates or destroyers, an attack submarine and a support ship of the Royal Fleet Auxiliary.
 * A Maritime Task Group of major warships.
 * A Mine Countermeasures Group.
 * An Amphibious Task Group which can deploy
 * A Joint Landing Force drawn from either 3 Commando Brigade or 16 Air Assault Brigade.

In the final phase, a Second Echelon may be deployed, with further major naval units and ground forces from 1st (UK) Armoured Division and 3rd (UK) Mechanised Division.

All of these elements can be supported by helicopters, transport and combat aircraft as required.