Peter Jackson says he understands 'R' rating for WWI doc

Peter Jackson's new WWI doc tells stories of boys who were on the front lines when they were just 14, 15 or 16 years old. But viewers that age won't be able to see the film without a parent when it's shown in U.S. theaters, due to an 'R' rating for disturbing war images. Jackson says he understands the ratings decision. (Dec. 13)