 A Control and Reporting Centre (CRC) at RAF Boulmer is tasked with compiling a Recognised Air Picture of UK air space and providing tactical control of the Quick Reaction Alert Force.In order to achieve this Boulmer is supported by a network of eight Remote Radar Heads (RRHs) spread the length of the UK.The UK operates permanent military airfields (known as Permanent Joint Operating Bases) in four British Overseas Territories.