Colonel Klink was played by Werner Klemperer who emigrated with his family from Cologne Germany in 1935, joined the US Army in WW II and served in Hawaii, joining the Army Special Services Unit touring the Pacific, entertaining the troops for the rest of the war.
Master Sergeant Schultz was played by John Banner (born Johann Banner in Vienna Austria), emigrated after Hitler annexed Austria in 1938, joined the US Army Air Corps in 1942 as a supply sergeant and served for the rest of the war, through 1945.