UK Air Defence
The primary role for the RAF is air defence of the United Kingdom. The Air Surveillance and Control Systems (ASACS) Force is responsible for compiling a Recognised Air Picture, with radars monitoring the airspace around the UK, and providing tactical control of the Quick Reaction Alert (QRA) force. QRA Typhoon aircraft and their pilots are ready to launch at very short notice from RAF Leuchars in Fife and RAF Coningsby in Lincolnshire. Where there are indications that an aviation security incident might develop, pilots will standby in the cockpit, ensuring aircraft can take off even more swiftly. This allows the RAF to respond across the country and over the seas around the UK, to defend against potential threats.