At the Greatest Level, what Was the Extent of the US Combat Power in Vietnam?

The Vietnam War is not such an honorable and noble war for the US. It started as a war for independence, and then it turned into a conflict between the North and South Vietnam for the future direction of the country after the withdrawal of the French. However, the North was led by a nationalist, Ho Chi Minh, and the US viewed this conflict as communism versus the free world. It was similar to the Korean War, with a communist, Kim Il Sung, in the North and Syngman Rhee in the South. The US sent its troops to Vietnam to help the corrupted South Vietnam dictator against the Vietminh, and at the end, the US people started to question why they were in Vietnam in the first place. The US lost the war, and Vietnam fell into communism.
The Vietnam War was a big time, money and efforts consuming war to the US. First of all, from the escalation of war (1945) till the withdrawal of the US (1975), it lasted for thirty years.
…