Perhaps by the numbers, but watch that old footage of our sailors literally dumping helicopters overboard in order to get the hell out of the sector faster. It's easy enough to say the US lost, but our troops sure as hell left there like they got our asses kicked.
It was no doubt a military adventure and a disaster, I would never try to deny that. It just irks me whenever someone talks about that retreat as if the Viet Cong mercifully chose to cancel the invasion of California once the Americans left, or that trained Americans flail about like headless chickens as soon as they step into a jungle.
At least in Syria the US would be fighting for the peoples' right to choose their own leaders instead of supporting some handpicked corrupt despot.