 Kuckhoff had known the Schulz-Boysen's since 1938 and started to engage them socially in late 1939 or early 1940 by bringing Mildred and Libertas together while on holiday in Saxony.In January 1941 Schulze-Boysen, now promoted to lieutenant, was assigned to the attaché group of the 5th department of the Reich Aviation Ministry.His new place of work was the air force command staff in Wildpark in Potsdam, where the headquarters of the Luftwaffe was located.