The chief of Japan's military resigned to take responsibility for the deaths of 30 civilians killed when a submarine collided with a sport fishing vessel last month. "I presented Prime Minister (Noboru) Takeshita with a notice of resignation today, just now," Tsutomu Kawara said at a news conference. Kawara was the first Defense Agency director general in 17 years to relinquish his post in a controversy linked to the armed forces. Takeshita appointed Kichiro Tazawa, 70, to replace Kawara. Only 18 of the 48 passengers on board the fishing boat survived when it collided with the submarine Nadashio in Tokyo Bay on July 23.