My Lai Massacre
Hue Massacre
Dak Son Massacre
The US tested napalm, bombs and chemical weapons on the Vietnam civilians.
I know of no illegal "rugs" that entered south Vietnam but there were illegal Drugs that did enter Vietnam.
IT WAS CONSIDERED ILLEGAL BECAUSE SOUTH VIETNAM NEVER DECLARED WAR ON NORTH VIETNAM AND VISA VERSA IT WAS A CIVIL WAR AND THE U.S. SHOULD NEVER GOT INVOLVED IN THEIR OPINION
Of course it was legal. Congress would not or could not "openly" fund an illegal war.
Vietnam War
War crimes
To quote some officers in Vietnam, "...the only war we had."
The Cold War; Vietnam was a "hot" battle of the cold war.
It was never a "declared" war, but a police action. So, it was seen as an illegal action not sanctioned or declared by Congress. This makes it not "real".
See website: Vietnam War Poetry
The war was wrong. It never was a war, but a police action and men were drafted to fight in an illegal undeclared war.
The Vietnam War or Second Indochinese War was a military engagement between North Vietnam and its allies (principally China and the USSR) and South Vietnam and its allies (principally the United States). From the South Vietnamese and US perspective, North Vietnam invaded South Vietnam in an attempt to annex it. From the North Vietnamese perspective, North Vietnam was liberating South Vietnam from illegal US occupation and manipulation.