On 15 April 1943 No. 1538 (Beam Approach Training) Flight RAF (No.15 BATF) formed at RAF Croughton and added to the station's training mission. Before this many of the pilots training with No. 20 AFU received their Beam Approach Training at RAF Feltwell. Both No. 1538 BATF and No. 20 AFU remained at RAF Croughton until 18 October 1944 when the airfield returned to Flying Training Command. On this date No. 1538 BATF disbanded and No. 20 AFU retired to Kidlington.