Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.

Context : Bruno Loerzer (22 January 1891 - 23 August 1960) was an officer in the German Luftstreitkrafte during World War I and Luftwaffe during World War II.
Answer : Luftwaffe
What military branch did Bruno Loerzer serve?