During my research of Eindhoven air base I cam across a Kommandantur Befehl of 3. September 1941 in which 1.FBK/K.Gr.126 is mentionned as based at Eindhoven. K.Gr. 126 became I./KG.28 in December 1940 and was based at Nantes until the end of 1941. So, I can't really figure out what the FBK is doing at Eindhoven.