In 1944, the Japanese Army sent then 23-year-old soldier named Hiroo Onoda to the small island of Lubang in the Philippines to lead a guerilla warfare.

In 1974, nearly 30 years after the war was over, he finally surrendered:

By the time he formally surrendered to Philippine President Ferdinand Marcos in 1974, Onoda had spent twenty nine of his fifty two years hiding the jungle, fighting a war that had long been over for the rest of the world.

Link | Hiroo Onoda [wiki]