The Nachrichtentruppe, in the sense of signal troops, were an arm of service in the army of the German Wehrmacht and Waffen SS, whose role was to establish and operate military communications, especially using telephone and radio networks. By order of the Oberkommando der Wehrmacht dated 14 Oct 1942, it was part of the combat arms of the German Wehrmacht and Waffen SS until 1945. The colour allocated by the Wehrmacht and Waffen SS in 1935 to their signal corps was lemon yellow. By contrast, the corps colour of the air force signal troops of the Luftwaffe was brown.