 Complete the following phrase:  Helmuth Förster 19 April 1889  7 April 1965 was a German general in the Luftwaffe during World War II. A decorated World War I aviator, he returned to military service in 1934 as an Oberstleutt in the Luftwaffe. Promoted to Oberst in 1936, he was appointed to command the 4th Bomber Wing. During the invasion of Poland, Förster commanded the Lehrdivision with significant success. He was then appointed as chief of staff of the 5th Air Fleet during the invasion of Norway. After serving on the German-French Peace Commission, he was appointed as military governor of the German-occupied territory of Serbia from April to June 1941, then commanded the 1st Air Corps during 