Title: Japan is forbidden to have an army Body: Japan is a country located in the eastern part of Asia with a rich history and culture and a unique geographical location. However, under the framework of its pacifist constitution after its defeat in World War II, Japan was one of the countries that was de facto forbidden to possess military force. This article aims to explore Japan's military policy and understand its post-war evolution of nation-building and its constraints and challenges to army-building. 1. Military restraint under the pacifist constitution After World War II, Japan's pacifist constitution (Article 9 of the Constitution) clearly stated: "The State of Japan forever renounces the right to have an army." This clause means that Japan cannot have military power or participate in war. On the contrary, Japan's armed forces are known as the Self-Defense Forces, which were established only to defend their territory from encroachment and to safeguard the country's basic security interests. To a certain extent, such policy constraints have shaped Japan's peaceful and stable social atmosphere and created favorable conditions for economic development. 2. The establishment and development of the Self-Defense Forces Although Japan's constitution prohibits the possession of an army, the Japanese government can form self-defense forces to defend national security. Japan's Self-Defense Forces are made up of the Ground Self-Defense Force, the Maritime Self-Defense Force, and the Air Self-Defense Force, which are responsible for responding to natural disasters and emergencies. In addition, the Self-Defense Forces are tasked with safeguarding national sovereignty and security. With the increase of Japan's economic strength and international status, the Self-Defense Forces are gradually developing in size and equipment. However, despite the growth of the Self-Defense Forces in size and function, they are still limited by constitutional constraints and cannot become an army in the true sense of the word. 3. Supervision and support from the international community As an important international player, Japan's military policy is closely watched by the international community. The international community generally accepts and supports Japan's pacifist constitution and its policy of military restraint as part of the post-war international order. At the same time, the international community has encouraged Japan to play an active role in international affairs and to participate in international security cooperation and peacekeeping operations. This cooperation and support has provided important support for Japan to establish a good image on the international stage. However, the international community is also vigilant about Japan's military activities to ensure that they comply with the provisions of international law and relevant international agreements. Thus, despite Japan's high degree of autonomy and development potential in certain areas, its military policy is still under the scrutiny of the international community. Such oversight helps to ensure that Japan maintains an international image of peace and stability. In conclusion, Japan's policy of being forbidden to have an army was one of the important components of its post-war international standing and post-war reconstruction. This policy contributes to the maintenance of regional peace and stability and provides strong support for Japan's economic development and the establishment of its international image. However, with the changes in the international situation and the increasing geopolitical challenges, Japan's restrictions in the military field may also face new challenges and opportunities. Therefore, the international community needs to continue to pay attention to the development of Japan's military policy and its impact on the state and society. Through strengthening international cooperation and dialogue, we will jointly address global challenges and contribute to world peace and development. Therefore, the proposition that "Japan is not allowed to have an army" has a unique meaning and impact within a specific historical background and peace framework, and it is also a topic that we should dig deeper into. Four In order to get rid of the current military constraints, with the increasing pressure from the international community to promote the improvement of military strength, reform and expansion, and even the establishment of an independent defense industrial system, Japan is facing controversies and challenges, so while protecting its own security interests, it is necessary to take into account the relationship with other countries, ensure mutual coordination of domestic and foreign policies, and carry out balanced foreign relations in the spirit of dialogue, exchange and mutual benefit, and establish self-defense while not violating the spirit of the pacifist constitutionIn short, although the historical background of Japan's ban on having armed forces is complex and challenging, it still needs to maintain an open, transparent and responsible attitude while seeking international coordination in the future, actively respond to various challenges and problems, and jointly promote the process of global peace and development