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Karl Gratz (24 January 1919 – 14 March 2002) was an Austrian-born Luftwaffe fighter pilot during World War II. As a fighter ace, he was credited with 138 aerial victories claimed in more than 900 missions. Gratz claimed the majority of his victories over the Eastern Front, and 17 over the Western Front.
In late 1941, Gratz was posted to Jagdgeschwader 52 (JG 52—8th squadron of the 52nd Fighter Wing) which at the time was fighting on the Eastern Front. He claimed his first aerial victory on 15 February 1942. On 1 July 1942, he was awarded the Knight's Cross of the Iron Cross following his 54th aerial victory. He then served as a fighter pilot instructor and was posted to Jagdgeschwader 2 "Richthofen" (JG 2—2nd Fighter Wing) in March 1943. Back on the Easter Front in 1944, he claimed his 100th aerial victory in March/April 1944. At the end of World War II, he served as Staffelkapitän (squadron leader) of 10. Staffel (10th squadron) of JG 52. He surrendered to United States Army forces and was turned over to the Red Army.
Gratz was released from captivity in 1949, joined the Bundeswehr and served in Jagdbombergeschwader 33 (JaBoG 33—Fighter-Bomber Wing 33). He retired in 1970 holding the rank of Oberstleutnant (lieutenant colonel). Gratz died on 14 March 2002 in Leck.