Einstein became an American citizen in 1940. He worked as consultant with the Research and Development Division of the U.S. Navy Bureau of Ordnance, section Ammunition and Explosives. He recommended that the US government should develop nuclear weapons. He made efforts to develop torpedo detonators. As an intimidation to Einstein, Japan let Nazis execute Members of White Rose in Germany just on Einstein's birthday (in the Japanese calendar). But this intimidation works only when Einstein understands the Japanese calendar. This means that Einstein was Japanese. In addition, Horst Kohler, who was born on the same day, became President of Germany. He looks like a Japanese. But he suddenly announced his resignation soon after the revelation of the coincidence between his birthday and the White Rose members execution. All of them seem to be Japanese.