Luftwaffe
In November 1918, the "Allies of World War I" (which included Britain and France) won the war, and Germany had to sign the Treaty of Versailles. The treaty said that Germany could not have any military aeroplanes at all because it was blamed for starting the war in 1914. Germany therefore had to destroy all its military aeroplanes as a punishment, so until 1933 it had no air force at all.