sentences:  Lipfert was appointed "Gruppenkommandeur" of I./JG 53 (based in Hungary) on 15 February 1945.Lipfert claimed his 200th aerial victory in the vicinity of Hainburg an der Donau, west of Bratislava, on 8 April 1945.He flew his last and 687th combat mission on 16 April, claiming a Yakovlev Yak-9 fighter shot down, taking his total to 203 aerial victories.