Weiss served in the
United States Army Air Forces during World War II, but his training as a
tail gunner ended when the plane he was in crashed and severely injured his legs. His ability to speak the
German language led to his being recruited by the O.S.S. for service in Germany. Serving with the
Counterintelligence Corps in the months following the fall of Nazi Germany, Weiss questioned many members of the Nazi hierarchy in advance of their trials. Weiss's unit was given the responsibility of confirming
Adolf Hitler's death, and together with
Hugh Trevor-Roper located
Wilhelm Zander, who had been
Martin Bormann's adjutant, using information that had been obtained by contacting members of his family. While being questioned, Zander described the circumstances in
Hitler's Berlin bunker in the last days before he committed suicide. Under interrogation, Zander disclosed that he had been sent out of the bunker in order to transport a series of documents, which included an attestation to Hitler's marriage to
Eva Braun. Also among the documents that were recovered was Hitler's last will and testament, which named Bormann as his
executor and was later introduced as evidence during the
Nuremberg Trials. Weiss was awarded the
Commendation Medal for his role in "apprehending a personality high in the annals of the Nazi system". Another soldier, Herman Rothman, made a claim in a 2009 book that Hitler's will had been located months earlier than the date based on Weiss's account, and a book by Hugh Trevor-Roper made no mention of Weiss or of his role in uncovering Hitler's will. ==Military awards==