The Japanese Self-Defense Forces, which grew up in a peaceful and democratic environment after the war, tried to restore the "glory" before the war more than once. Ren Lei's "three-vector theory" belongs to this incredible "condescending" incident, the essence of which is to openly confront the civilians and evoke the soul of Japanese militarism.

The so-called "three-vector study" refers to a top secret "deduction on the comprehensive map of Showa 38 years" conducted by the Joint Chiefs of Staff of the Self-Defense Forces in February 1963 (code name "three-vector study"). At that time, with Major General Tanaka Liangxiong, director of the Joint Chiefs of Staff, as the commander, 84 cadres of the Army, Navy and Air Self-Defense Force of the Joint Chiefs of Staff participated in the map deduction of this imaginary war.

The plot of "the study of three vectors" is quite horrible and is divided into seven stages. In the first stage, it is assumed that the political situation in South Korea deteriorates and some troops launch rebellion, which leads to the deterioration of public security in Japan. In the second stage, the South Korean rebels were supported by the North Korean side, and the US military intervened to launch a counterattack. A similar situation occurred in the Korean Peninsula and Vietnam.

The third stage is the outbreak of the second Korean War, and the situation in West Japan is in jeopardy. The self-defense forces entered the first-level combat readiness and mobilized the whole country. In the fourth stage, the military and political situation in South Korea further collapsed, and the Self-Defense Forces sent troops to cooperate with the US military.

In the fifth stage, Kyushu in western Japan was attacked by North Korea, the US military used nuclear weapons on the peninsula, and Hokkaido in Japan was also seriously threatened by the Soviet Union. In the sixth stage, the Soviet Union intervened on a large scale, and Japan and the United States cooperated again. In the seventh stage, the whole territory of Japan was attacked by the Soviet Union, and the use of nuclear weapons expanded to the whole battlefield. The US troops stationed in Japan retaliated against Sakhalin Island, North Korea and China, and the United States won the final victory.

Although this is a daydream-like "sci-fi script", the Self-Defense Forces have fully studied the situation before the third stage, and envisaged submitting as many as 87 war bills to the National Assembly and implementing a series of "wartime measures", such as establishing a national general mobilization system and replacing the police with the Self-Defense Forces to undertake domestic security tasks. If all this comes true, then Japan will return to the era of "imperialist countries" in which the military was in power before the war.

Two years later, this secret "research achievement" was discovered by Okada Haruo, a member of the Socialist Party, and immediately made public to Congress and society. Finally, the whole incident ended with the resignation of most members who participated in the "three-vector research". For a long time after that, the construction of self-defense forces and national defense affairs became forbidden areas in Japanese political circles. Whoever dares to openly support the expansion of the Self-Defense Forces to prepare for war will be unlucky.

However, the militant forces within the Self-Defense Forces have not been eradicated. In fact, from its establishment to the end of the 1980s, some key leadership positions of the Self-Defense Forces were held by veteran officers. For example, the history of the third post-war aviation chief of staff (equivalent to the chief of staff of the Air Force) was one of the founders of the Kamikaze special forces in World War II. These old soldiers respected the militaristic theory of advocating war in their bones.