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.
In October 1962, during the Cuban Missile Crisis, the squadron was kept at full readiness, with the missiles aimed at strategic targets in the USSR. The squadron was disbanded with the termination of the Thor Program in Britain, in 1963.