No 254 Squadron was formed in May 1918 from Nos.492, 517 and 518 Flights at the coastal reconnaissance station at Prawle Point and flew anti-submarine patrols until the end of the war, disbanding on 22 February 1919. No. 254 Squadron of the Royal Air Force was reformed in 1959 as one of 20 Strategic Missile (SM) squadrons associated with Project Emily. The squadron was equipped with three Thor Intermediate range ballistic missiles. and based at RAF Melton Mowbray.