Context : Hansgeorg Bätcher (13 January 1914 -- 23 April 2003) was a highly decorated Oberstleutnant bomber pilot in the Luftwaffe during World War II, and one of only 882 recipients of the Knight's Cross of the Iron Cross with Oak Leaves. 
Question : What is the war during which Hansgeorg Bätcher was in the armed forces?
World War II