http://dianawest.net/Home/tabid/36/EntryId/965/-Cronkites-Offensive-History.aspx
http://www.wsj.com/articles/SB120226056767646059
Do a google search, you will find more.
Is it your opinion that America was winning in Vietnam?
If so, what were we winning, exactly, and to what end should we have continued? How would it have ended if we had pursued it further? I see no worthwhile goal.