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Tet Offensive (1968) is a turn-over event during the Vietnam War. This is the turning point of the war, forcing the USA to "recognise" the failure there and bringing them to negotiation table. Sure, it took a few more years with a lot more deaths, military and civilian alike, but it achieved (partially) what it aimed for - the end of the war and the unification of Vietnam.
There are many factors why Tet Offensive (including the "mini-Tet" in May to August) was a failure, but underestimating the US and allies, and the Saigon Regime was a major failure of the DRVN and NLF (usually known as "North Vietnam" and "VC" respectively).
My question is - what if they did not? What if they were able to amass enough strength during the later half of 1967 and via build-up in previous years? Can they succeed in having a military victory?
I define "military victory" as taking control of most (over 75%) of cities in southern region of Vietnam for a period of time. Whether it ended with peace talk or the overwhelming retaliation of USA is a another story.
May be I can turn this one into a story if anyone is interested.
TLDR: Assuming the DRVN and/or NLF had better preparation and were able to gain (temporary/permanent) control of South Vietnam in Tet Offensive, what would happen?