Before and during World War II, he served as a personal adjutant to foreign minister Joachim von Ribbentrop.

[1] Schulze served as personal adjutant to Foreign Minister Joachim von Ribbentrop from April 1939 until January 1941.

[2] Schulze is pictured standing with Molotov, Ribbentrop, Stalin and Soviet Chief of Staff Shaposnikov at the signing of the Molotov–Ribbentrop Pact of 23 August 1939.

At that time, Schulze was the commanding officer of the SS-Brigade Nibelungen and the SS cadet training school at Bad Tölz.

[3] He remained in contact with a group of former adjutants, secretaries and other staff members who continued to have a favourable view of Hitler following the end of the war.