Sensha-dō is a form of martial arts that involves the use of tanks as weapons. This martial art was exclusive for women who start practicing it as early as from elementary school up to high school, university and adulthood. Now it's allowed for everyone. According to an old film called “Introduction to Sensha-dō”, the purpose of Sensha-dō is for women to grow their self-esteem, assist them in becoming professional and efficient citizens and develop the characteristics necessary to become good wives and mothers. Given the film was released in 1939 and sound more like propaganda, by the time Sensha-dō is seen and treated more like a sport in which everyone have fun and compete generally in a friendly way and where you have, like in most modern-day sports, leagues, tournaments, regulations, teams and spectators watching Sensha-dō matches in the stands or in television.