All German citizens were watched by Gestapo. Everybody had a file in Gestapo archives, including Hitler. In Hitler’s file, there was a copy of a statement of a Nazi officer who defected during a secret mission.
When he was caught, he told the investigators that before the mission Hitler wanted to talk to him privately. Hitler told him that the mission is a suicide mission and he just wanted to say goodbye.
The officer got scared and he deserted. The mission wasn’t a suicide mission at all as Hitler said. It was just a macabre joke; this in the case the officer declared the truth. I strongly believe that was the truth, considering Hitler’s aversion to any officer.