There are some short documentary on the Auxiliary Units on Youtube: https://www.youtube.com/watch?v=FgCamfiEqkc https://www.youtube.com/watch?v=FgCamfiEqkc , ht

There are some short documentary on the Auxiliary Units on Youtube: https://www.youtube.com/watch?v=FgCamfiEqkc https://www.youtube.com/watch?v=FgCamfiEqkc , https://www.youtube.com/watch?v=jedeTE-MUXo https://www.youtube.com/watch?v=jedeTE-MUXo