sentences:  At the same time the Telecommunications Flying Unit (TFU), later named the Radar Research Flying Unit (RRFU), which operated flight trials on behalf of the TRE, transferred its aircraft to Defford.So hurried was the move to Defford that many of the personnel had to be accommodated in tents at first.However, at Defford the tempo of work carried out by TFU increased month by month, and by 1945 there were approximately 2,500 personnel and 100 aircraft on the station.