Izumo, which Japan calls a helicopter destroyer. It is not an aircraft carrier and cannot have offensive weapons, which is not stipulated in the San Francisco Peace Treaty. 195 1 On September 8th, 2008, representatives from 48 countries, including Japan, signed the San Francisco Peace Treaty at the San Francisco War Memorial Opera House in San Francisco, USA. Chapter III: Security Article 5 The United Nations collective defense and the right of self-defense. The Allies recognized that Japan, as a sovereign country, had inherent rights such as the right of individual or collective self-defense according to Article 5 1 of the Charter of the United Nations, and Japan could independently conclude collective security agreements. Such a vague treaty has considerable flexibility in interpretation. Japan promotes helicopter destroyers, whose main task is anti-submarine, and the main function of anti-submarine is escort and defense. This explanation can rely on the right of self-defense. In fact, these are not important, the key is to look at the attitude of the victorious country. Among the victorious countries, only the United States now has troops stationed in Japan, so the attitude of the United States is the key. But now the economic situation in the United States is sluggish, and American military forces are facing a crisis of contraction. At this time, the limited rise of Japanese military forces under the control of the United States was to doze off and hit pillows. It is too late for the United States to like it, and it will not order Japan not to go into the water.