In 2030, the "shield" satellite system set up by the major powers in space ends the era of ballistic missiles. The danger of nuclear war is no more. In 2035, the United States fell into a great crisis of ethnic and political conflict. An armed conflict takes place within the United States and make lose its global leadership role. In 2040, the world is dominated by 12 multinational military organizations. The conflicts are getting more intense and the world is facing a new world war. The Endwar.
The JAF is a military alliance led by Japan. With two other members, the South Korean army in exile and the Taiwanese resistance force. After the US had an internal conflict and South Korea was destroyed by the APA. Japan reorganized its military forces and returned to armed development. After the APA invaded Taiwan, Japan declared war on the APA and formed the JAF military alliance. The JAF has a close alliance with the VPA in the Pacific theater.