Jagdgeschwader 52 included the fighter ace who joined the Luftwaffe in what year?
Gerhard Barkhorn Gerhard "Gerd" Barkhorn (20 March 1919 – 8 January 1983) was the second most successful fighter ace of all time after fellow "Luftwaffe" pilot Erich Hartmann, the two people to ever exceed 300 confirmed victories. Barkhorn joined the "Luftwaffe" in 1937 and completed his training in 1939.
Walter Wolfrum Walter Wolfrum (23 May 1923 – 26 August 2010) was a pilot in the Luftwaffe during World War II. He is credited with 137 aerial victories—that is, 137 aerial combat encounters resulting in the destruction of the enemy aircraft. He was also a recipient of the Knight's Cross of the Iron Cross of Nazi Germany.