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.
Theo Osterkamp Theodor "Theo" Osterkamp (15 April 1892 – 2 January 1975) was a German fighter pilot during World War I and World War II. A flying ace, he achieved 32 victories in World War I. In World War II, he led Jagdgeschwader 51 through the Battle of Britain and claimed a further 6 victories, in the process becoming one of only a few men to score victories in both world wars.