Luftnachrichten Abteilung 350

The Luftnachrichten Abteilung 350, abbreviated as OKL/Ln Abt 350 and formerly called the (German: Oberkommando der Luftwaffe Luftnachrichtenabteilung 350), was the Signal Intelligence Agency of the German Air Force, the Luftwaffe, before and during World War II. Before November 1944, the unit was the German: Chiffrierstelle, Oberbefehlshaber der Luftwaffe, lit. 'code centre, High Commander of the Air Force', which was often abbreviated to Chi-Stelle/ObdL or more commonly Chi-Stelle. The founding of the former agencies of OKL/Ln Abt 350 dates back to the year 1936, when Colonel (later General der Luftnachrichtentruppe) Wolfgang Martini instigated the creation of the agency, that was later established on the orders of Hermann Göring, the German politician, head of the air force, and leading member of the Nazi Party.

Source: Wikipedia — Luftnachrichten Abteilung 350 (CC BY-SA 4.0)