The airfield was perhaps the most secret airfield in the Second World War. It was home to the Special Duties Squadrons, No. 138, which dropped Special Operations Executive (SOE) agents and their supplies into occupied Europe, and No. 161, which specialised in personnel delivery and retrieval by landing in occupied Europe. RAF Tempsford is very close to Little Gransden Airfield and can be clearly seen from flights climbing out from the westerly runway 28. Other active airfields nearby include the former RAF bases at Gransden Lodge and Bourn.