Well Khan sahib, I would maintain that Vietnam was a strategic(political) defeat for US. US tactical conduct of the war was good.But their political vision was limited.They achieved tactical dominance over battlefield most of the time; but it failed to materialize into a final victory.US never went full on to attack the NVA.Even their bombing campaign was limited. US warplanes were forbidden to bomb Viet capital.They were initially forbidden to attack airbases. US strategy was reactionary in Vietnam, how could a reactionary strategy garner victory? Tet offensive is a nice example. US broke the Vietcong's back during Tet, but victory in battlefield was seen by US public as failure of US strategy in Vietnam. That's what I stated in my post. Vietnam was a strategic blunder for US.
What you said is reflective of the fact that: Political goals determine military objectives.
Military objectives are:
- Take that city.
- Surround that hill.
- Blockade that sea access.
- Sever that supply line.
- And so on...
Military objectives are short term, tangible, and quantifiable.
Not so for a singular political goal or many political goals. They are 'visionary' or long term, often lacking in details but emotionally satisfying.
North Viet Nam's political goal was unification of Viet Nam under one rule: communism.
South Viet Nam's political goal was division of Viet Nam under disparate regimes. Although it did harbored the greater 'vision' of a non-communist Viet Nam in the future.
Their respective allies shared their political goals, although the Soviet Union at one time actually proposed
BOTH Vietnams to be admitted to the UN with full membership standing.
When you have such divergent political goals that dictated their military objectives, you will have a war that will not end until the cessation of existence of one side. That was why the US/SVN alliance never breached the 17th parallel but North Viet Nam continually did and even to the point of violating the territorial integrity of two neighbors -- Laos and Cambodia -- to support an insurgency in the south.
The US never ceded the battlefields in Viet Nam and utterly dominated the air over the entire country. But if successful military objectives are necessary at the negotiating table for the diplomats to resolve differences, those same successful military objectives can be discarded when they are deemed useless for other political goals.
That was what happened in Viet Nam.