Mr. Onoda, after being persuaded that the war was over.Credit...Jiji Press/Agence France-Presse — Getty Images Hiroo Onoda, an Imperial Japanese Army officer who remained at his jungle post on an island in the Philippines for 29 years, refusing to believe that World War II was over, and returned to a hero’s welcome in the all but unrecognizable Japan of 1974, died on Thursday in Tokyo. He was 91.