Question:  Jagdgeschwader 52 included the fighter ace who joined the Luftwaffe in what year?
Sentence (from "Jagdgeschwader 52"): "Jagdgeschwader" 52 (JG 52) (52nd Fighter Wing) of the Luftwaffe, was the most successful fighter-wing of all time, with a claimed total of more than 10,000 victories over enemy aircraft during World War II.
Relevant evidence: No