Based at RAF Mildenhall, in the UK, the 21st Special Operations Squadron (SOS) with its 250 personnel, as part of the 352nd Special Operations Group (SOG) was officially deactivated on October 9, 2007. The 21st SOS, known as the ‘Dust Devils’, flew the Sikorsky MH-53M Pave Low IV helicopter until the last flight from their home base on September 13. All five Pave Lows in the fleet took the air for the final flight, which included aerial refuelling with their 67th SOS stable mates flying a MC-130P Combat Shadow. Up until deactivation, the 21st SOS were the USAF Special Operations European Command’s only vertical lift unit, their tasks are to be taken over by the US Army. Held on continuous stand-by they can be tasked at a moments notice with a broad range of operations, from Combat Search and Rescue (CSAR) to humanitarian relief. For most of the year they will find themselves on Special Operations duties away from Mildenhall.