were made of cardboard and wood and some real, but old tractors were driven around the site. The Germans attacked the dummy field a number of times and it was rebuilt each time. On 15 July 1940, four 250 kg bombs failed to explode, 2 of them near assembly sheds. It was unclear to the newly appointed bomb disposal team led by Colonel Stuart Archer GC whether they were dealing with delayed action fuses -then causing major disruptions to vital buildings and airfields or more likely booby-trapped devices. The decision was taken to move the bombs to be detonated elsewhere. The UK's Airborne Interception radar (AI) efforts were briefly housed at St Athan in late 1939 and early 1940. Prior to the war they had been located with the rest of the radar research efforts at Bawdsey Manor on the east coast, but with the opening of hostilities they were quickly moved to a tiny civilian airfield outside Perth, where they found the conditions entirely unsuited to their efforts. After a short search, St Athan was selected for the AI team while the rest of the researchers stayed in Dundee. When they too found the conditions unsuitable, both teams moved to Worth Matravers in May 1940. The following units were here at some point: Post war After the war, airmen of the Airframe and Engine trades continued to train at St Athan, but in 1955 this training dispersed to RAF Kirkham and RAF Weeton. 4SofTT then became a Boy Entrant School, with new recruits being trained in engine and airframe mechanics, and armament, electrical and instrument mechanics. It was at this time that approval was given by the Airforce Board of the Defence Council for the formation of 2300 Sqn ATC. Following the demise of the Boy Entrant scheme in 1965, airman training returned to St Athan for the vehicle and general and Airframe, Engine aircraft maintenance trades. During the 1960s, a driving school was established. Recruits that needed to drive (RAF Police, MT (Mechanical Transport) drivers, etc.) were trained in a fleet of Morris Minors, including "Travellers", and were taught basic maintenance. The driving tests were normally taken in Cardiff and, once students had passed, they were then allowed to train in night and motorway driving, and practise on a skid-pan. 21st century St Athan also became the major RAF maintenance base for Vulcan, Victor, Buccaner, Phantom, Harrier, Tornado,