General der Nachrichtenaufklärung

The GdNA (German: Oberkommando des Heeres/General der Nachrichtenaufklärung) was the signals intelligence agency of the Wehrmacht, before and during World War II. It was the successor to the former cipher bureau known as Inspectorate 7/VI in operation between 1940 and 1942, when it was further reorganized into the Headquarters for Signal Intelligence (German: Leitstelle der Nachrichten Aufklaerung) (abbr. LNA) between 1942 and 1944, until it was finally reorganized in October 1944 into the GdNA. The agency was also known at the OKH/Gend Na, GendNa or Inspectorate 7 or more commonly OKH/GdNA. Inspectorate 7/VI was also known as In 7 or In/7 or In 7/VI.

The letter "Chi" for the Chiffrierabteilung is, contrary to what one might expect, not the Greek letter Chi, nor anything to do with the chi test, a common cryptographic test used as part of deciphering of enciphered message, and invented by Solomon Kullback, but only to the first three letters of the word Chiffrierabteilung (English:cipher department). Chi-Stelle, which was also a short hand for Chi, translates to Cipher Department Location.

General Erich Fellgiebel 1931–1932 Chief Code and Cipher Section of German Defense Ministry 1931–1932; Chief Signal Officer Army High Command and Supreme command of Armed Forces. General Fellgiebel was killed in July 1944 after attempt on Hitlers life in the failed 20 July plot

Lieutenant Colonel Metting was a signals officer who worked up to command the Germany Armies cryptologic centre, Inspectorate 7/VI from November 1941 to June 1943. After working in the Signals Battalion on the Eastern Front for several months, He was assigned second in command of OKW/Chi in December 1943. After the war he was considered such a high-value target that he was moved to England to be interrogated by TICOM.

Major General William Gimmler, Chief Signals Officer subordinated to Commander in Chief OB West and Chief of the Armed Forces Signal Communications Office.

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