Definition: Generate a correct and concise answer for the question based on the words in the context.
Input: Context : Reinhard Graubner (2 August 1915 -- 3 November 1986) was a highly decorated Major in the Luftwaffe during World War II, and a recipient of the Knight's Cross of the Iron Cross. 
Question : Which conflict was Reinhard Graubner a part of?
Output:
World War II