During the long war of attrition in Vietnam, the United States had no choice but to withdraw its troops. Many people are curious about why south Vietnam still had a million troops after the Withdrawal of The United States, and why was it completely annihilated by the North Vietnamese regime in less than two years.
As we know, the United States, which has excellent equipment and strong combat effectiveness, has suffered a lot of losses at the hands of North Vietnam, not to mention the "million army" of South Vietnam.
After the end of World War II, there were two camps in the world, one capitalist and the other socialist, and the North and South Vietnamese belonged to different camps. For reasons and camps for reunification, there must be a war between the two regimes. The war of reunification in Vietnam began in 1955, and at first the United States was reluctant to intervene directly in the war. However, south Vietnam was too weak, and under the north Vietnamese offensive, it was about to be destroyed, so the United States could not directly intervene in the war. The reason for the United States' direct entry into the war was simple: it did not want a unified Vietnam to fall completely to the other camp.
From this, it can be seen how weak south vietnam's combat effectiveness really is, and if it were not for the United States, South Vietnam would probably perish. During the Vietnam War, South Vietnam could not defeat North Vietnam from the beginning, and it is not surprising that the "million army" only lasted two years after the withdrawal of the United States.
In the Vietnam War, it was basically the U.S. military that was fighting, and the South Vietnamese army only maintained local power. The South Vietnamese army did not gain much experience from the war, and the North Vietnamese continued to grow stronger in the war with the Americans. One relies on oneself and the other on others, and the outcome can be imagined without the support of the United States.