Royal Air Force Benson or RAF Benson is a Royal Air Force (RAF) station located at Benson, near Wallingford, in South Oxfordshire, England. It is a front-line station and home to the RAF's fleet of Westland Puma HC2 support helicopters, used primarily for the transportation of troops & equipment. Flying squadrons comprise No. 33 Squadron flying the Puma, No. 22 Squadron which provides operational evaluation and training for all aircraft in Joint Aviation Command and No. 28 Squadron, which is the combined Puma and Boeing Chinook HC6A training unit. Other units include the Oxford University Air Squadron and No. 6 Air Experience Flight, both flying the Grob Tutor T1 light training aircraft used for student and cadet flying training. The National Police Air Service and the Thames Valley Air Ambulance are also based at the station, both operating Airbus H135 helicopters.