What was the approval rating for the Vietnam War?

Of course there was a loud group that opposed the war and they became increasingly vocal and gained credence in the public's eye as the war drug on. Time may have altered public acceptance and perception of what Vietnam was all about. Richard Nixon said: "No event in American History is more misundertood than the Vietnam War. It was misreported then, and it is misremembered now. Rarely have so many people been wrong about so much. Never have the consequences of their misunderstanding been so tragic." Two ratings provided by General William Westmorland in his post-war research deserve mention: 91 percent of all Vietnam Vets polled say they are glad they served and 74 percent said they would do it again even knowing the war's outcome.