By 1942, there was no longer a need for an additional fighter airfield. With its name changed to RAF Lulsgate Bottom, the airfield was declared operational on 15 January 1942. The Miles Masters, Airspeed Oxfords and Hawker Hurricanes of No. 286 (AA Cooperation) Squadron became resident, with the role of providing realistic exercises for ground anti-aircraft defences. However, as the site lacked some basic facilities, No. 286 moved to RAF Zeals in May. From 1 June 1942, the airfield was under No. 23 Group of Flying Training Command, and initially became a satellite airfield for No. 3 (Pilot) Advanced Flying Unit (3 (P)AFU), based at RAF South Cerney, flying Oxfords. In March 1943, No. 1540 Beam Approach Training Flight (1540 BATF) was formed at Lulsgate, again flying Oxfords. On 27 September 1943, 3 (P)AFU left Lulsgate for RAF Southrop, and was replaced on 1 October 1943 by No. 3 Flying Instructors School (3 FIS), which was previously headquartered at RAF Hullavington. 3 FIS flew mostly Oxfords and some Masters.