Kellogg–Briand Pact
One of the terms of the Treaty of Versailles, which had been in place since the end of World War I, stated that Germany was not allowed to maintain an air force. After the 1926 signing of the Kellogg–Briand Pact, police aircraft were permitted. Göring was appointed Air Traffic Minister in May 1933. Germany began to accumulate aircraft in violation of the Treaty, and in 1935 the existence of the Luftwaffe was formally acknowledged, with Göring as Reich Aviation Minister.