of Royal Engineers, Army Air Corps and Royal Army Medical Corps. Royal Air Force The Royal Air Force has a large operational fleet that fulfils various roles, consisting of both fixed-wing and rotary aircraft. Frontline aircraft are controlled by Air Command, which is organised into five groups defined by function: 1 Group (Air Combat), 2 Group (Air Support), 11 Group (Air and Space operations), 22 Group (training aircraft and ground facilities) and 38 Group (Royal Air Force's Engineering, Logistics, Communications and Medical Operations units). In addition 83 Expeditionary Air Group directs formations in the Middle East and the 38 Group combines the expeditionary combat support and combat service support units of the RAF. Deployable formations consist of Expeditionary Air Wings and squadrons—the basic unit of the Air Force. Independent flights are deployed to facilities in Afghanistan, the Falkland Islands, Iraq, and the United States. The Royal Air Forces operates multi-role and single-role fighters, reconnaissance and patrol aircraft, tankers, transports, helicopters, unmanned aerial vehicles, and various types of training aircraft. Ground units are also maintained by the Royal Air Force, most prominently the RAF Police and the Royal Air Force Regiment (RAF Regt). The Royal Air Force Regiment essentially functions as the ground defence force of the RAF, optimised for the specialist role of fighting on and around forward airfields, which are densely packed with operationally vital aircraft, equipment, infrastructure and personnel . The Regiment contains nine regular squadrons, supported by five squadrons of the Royal Auxiliary Air Force Regiment. In addition, it provides the UK's specialist Chemical, Biological, Radiological and Nuclear capability. It also provides half of the UK's Forward Air Controllers and the RAF's contribution to the Special Forces Support Group. By March 2008, the three remaining Ground Based Air Defence squadrons (equipped with Rapier Field Standard C) had disbanded or re-roled and their responsibilities transferred to the British Army's Royal Artillery. Ministry of Defence The Ministry of Defence maintains a number civilian agencies in support of the British Armed Forces. Although they are civilian, they play a vital role in supporting Armed Forces operations, and in certain circumstances are under military discipline: The Royal Fleet Auxiliary (RFA) operates 13 ships which primarily serve to replenish Royal Navy warships at sea, and also augment the Royal Navy's amphibious warfare capabilities through its three vessels. It is manned by 1,850 civilian personnel and is funded and run by the Ministry