Two Navy ships collided while returning to base after maneuvers, killing one sailor and injuring eight, a Navy spokesman said in Honolulu. The 529-foot repair ship Jason and the 591-foot fleet oiler Willamette collided Monday night about 75 miles southwest of Pearl Harbor, said Lt. Cmdr. Tim Taylor. Fires were reported aboard both ships after the collision but were extinguished, Taylor said. The cause of the accident was not known, he said. The most seriously of the injured was airlifted to the medical center on Oahu.