What are some controversies around the continued presence of the united states troops in japan?

Some Americans argue that by stationing troops in Japan, the USA is paying for Japan's self-defense. This is a burden that should fall on Japanese taxpayers rather than on Americans. Some Japanese citizens are also disappointed or angered by the behaviour of American troops stationed in Japan. Japanese people are also argue that the WW2 ended very long time ago, so it's not necessary anymore for American troops to station In Japan