Kü.FI.Gr.606 vs K.Gr.606

[Peter Cook]

I am trying to establish the date when Kü.FI.Gr.606 was officially renamed as K.Gr.606. According to DeZeng and Stankey's Bomber Units of the Luftwaffe 1933-1945, Volume 2, although this unit was originally formed as a Küstenfliegergruppe, it designation was changed to a Kampfgruppe and was operating as K.Gr.606 by the time hostilities began. However, a number of loss lists for the Battle of Britain period refer to downed Do 17s of Kü.FI.Gr.606. Which is correct?