Werner Heisenberg was not an anti-Semitic; indeed, he even tried to hire a Jewish colleague into an open position at his University of Leipzig in the 1930s. He did not join the Nazi party. However, he was a dedicated German nationalist. He participated in the military drills of his reserve unit. Most distressing to his international colleagues, he refused to follow the example of Einstein and leave Germany as a symbolic protest against the Nazi regime and its attitude towards scientific inquiry.
Pugwash Manifesto, July 1955
FORUM: The Military in World History