Actually, the Thet Offensive pretty much finished off the Viet Cong, if you read Into the Storm by Tom Clancy and Gen. Fred Franks, you'll see that the major problem was the desire to institue a DMZ and political division between North and South, as in Korea. Essentially, the American Police Action failed because it was not preceeded by an actual war in which any attempt was actually made to defeat the NVA.
The Cage by Tom Abrahams is a more personal analysis by a British Officer of the problems he faced in the American Army.
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