thanks for the info. i know you already were out of country by the time the NVA pulled their Easter Offensive, but what did you think of the ARVN response? moreover, how was the ARVN during Lam Son 719?Permit me a stab at this, astralis. There were a lot of reasons. I think the main one is that "Vietnamization" was not the step-by-step, gradual transition of force that it should have been. It would have taken way too long to do it right. And even then, there were so many variables, some that I've touched on above, the situation was so complex and so gone-to-hell by that time that "Vietnamization" was not much better than an ad slogan.
it seems that the ARVN was able to stop the NVA in '72 with US air support but once that was gone they had nothing. i've heard conflicting evidence of the ARVN will to fight-- there were some ARVN units that went down very hard in '75 and some ARVN units that simply disappeared.