The conversation between human and AI assistant.
[|Human|] Given the below reference text about Luftwaffe, tell me for how many years was this military organisation active officially in Germany?
[|AI|] The Luftwaffe was officially active for about 11 years - 1935 to 1946.
[|Human|] 
Given the below reference text about Luftwaffe, tell me for how many years was this military organisation active officially in Germany?