sentences:  As naval use declined, it was also made available to the RAF and Shackleton squadrons from the base at RAF St Eval used it for air-to-ground firing at tanks fitted with recording equipment.But with the withdrawal of lying units from RNAS St Merryn in 1954 and changes made to Shackletons during 1955, the range was closed at the end of that year and quickly reverted to farmland.On 16 September 1943 an American B-17 Flying Fortress was forced to make an emergency landing at HMS Vulture II.