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Lets imagine for some reason US Millitary Official learn about Tet Offensive before its take place and is able to stop it. By arrests etc. preventing it from taking place.
With no Tet Offensive and especially no attack on the US Embassy, then the opinion towards the war wouldn't turn as it did in OTL?
Then would LBJ have stepped down in the 1968??
And could this eventually have let to a smaller anti-war movement in the US and eventuelly a US Victory?