The standard military Enigma cipher machine was used by both the German Army (Heer) and the German Air Force (Luftwaffe). This machine was manufactured in 1935 and was almost certainly used during the invasion of Norway. It is fitted with a very rare Reflector D (UKW-D) which was issued in 1944 - firstly to Norwegian Heer and Luftwaffe units. The UKW-D can be set differently every day, substantially improving security.