Men Behind the Sun

Men Behind the Sun (, literally meaning "Black Sun: 731") is a 1988 war-based horror movie. When it was released, the movie was rated III under the Hong Kong rating system (similar to the United States MPAA rating NC-17). The movie is about World War II with graphic materials. It was banned in some countries.
In Australia, it was refused classification. It was later rerated R18 on appeal.
In the United States, the movie was released without a rating.