Kenneth Ramirez, who served five terms as tribal secretary for the San Manuel Band of Mission Indians, was sworn in Tuesday as the Southern California tribe’s new chairman. Ramirez replaces Lynn Valbuena, who served three consecutive terms as the tribe’s chairman beginning in 2014. Valbuena has held elective positions both with San Manuel and nationally for nearly 30 years. In 2015, she was the first female tribal leader to be inducted in the American Gaming Association’s Gaming Hall of Fame.