International politics around Japan and in the world is changing. Especially in East Asia including the Sea of Japan, the East China Sea and the South China Sea, there are heightened tensions. Therefore, it is crucial to revise Japan's defense policies. National Defense Program Outline of the Japanese government was published in 1971 for the first time, and was not revised until 1995. However, after that, it was revised in 2004, 2009, 2013 and 2018. Intervals have become shorter. In this class we will compare and analyze defense policies of Japan and other countries, and review the change and the expansion of operational domains including land, sea, air, space and cyberspace. Non-traditional security issues in the environment, the Arctic Ocean and newly developed technologies are also considered. The goal of this class is to think of defense policies to achieve peace in international relations.