A documentary on female high school students recruited as nurses to serve in the Battle of Okinawa during World War II will be screened in Okinawa, Tokyo and other places, starting in late July.

The film, previewed in Naha on Saturday, includes interviews and testimony by surviving members of the Shiraume student nurse corps on their experiences.

Of its 56 members, all seniors at the No. 2 Okinawa Prefectural Girls' High School, 22 died working as nurses at an Imperial Japanese Army field hospital in a cave on southern Okinawa Island.

In preparation for the U.S. invasion of Okinawa, Japanese forces stepped up nurse training at girls' high schools and military training at boys' high schools in the prefecture.