We mourn for Prof Dr Reinhard Rürup, who played a significant role for our museum and reached huge achievements for it. Between 1991 and 2016 he has continuously acted as chairman of our scientific advisory council, which he became the honorary president of afterwards. With great skill and expertise Prof Dr Rürup moderated the transformation from a Soviet military museum to an institution nowadays jointly led by Germans, Russians, Ukrainians and Belarussians. He has a great share of our today´s achievement in terms of former enemies of WWII being able to join hands in peace and cooperation at the historical site of the German surrender on May 8th 1945. We will keep Prof. Dr. Reinhard Rürup, who deceased on Friday, 6th April 2018, in honourable memory.