> US military presence in Japan for the last half-century has meant that the Japan doesn't have to invest any money in security
Wikipedia seems to disagree with you [1]:
> In 1976, then Prime Minister Miki Takeo announced defense spending should be maintained within 1% of Japan's gross domestic product (GDP), a ceiling that was observed until 1986. As of 2005, Japan's military budget was maintained at about 3% of the national budget; about half is spent on personnel costs, while the rest is for weapons programs, maintenance and operating costs. As of 2013, Japan currently has the fifth largest defense budget in the world.
Wikipedia seems to disagree with you [1]:
> In 1976, then Prime Minister Miki Takeo announced defense spending should be maintained within 1% of Japan's gross domestic product (GDP), a ceiling that was observed until 1986. As of 2005, Japan's military budget was maintained at about 3% of the national budget; about half is spent on personnel costs, while the rest is for weapons programs, maintenance and operating costs. As of 2013, Japan currently has the fifth largest defense budget in the world.
[1] https://en.wikipedia.org/wiki/Japan_Self-Defense_Forces#Budg...