 Short Stirling III's from 199 Squadron arrived in May 1944 to complete Window and Mandrel operations against enemy radar tracking of Bomber Command raids, however during March 1945 these were changed to Handley Page Halifax III's.In September 1944, No.199's 'C' Flight was used to re-form 171 Squadron, who contributed to 100 Group's radio counter-measures activities with Halifaxes.