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FS2002/FS2004 RAF Boulton Paul Defiant Mk.I. This was a British interceptor aircraft that served with the Royal Air Force (RAF) during the Second World War. The Defiant was designed and built by Boulton Paul Aircraft as a "turret fighter", without any forward-firing guns. The concept of a turret fighter related directly to the successful First World War-era Bristol F.2 Fighter. By Kazunori Ito.