A lot of people (especially Liberals) miss the point that our remaining folks evacuated a full two years after the US combat foces left Vietnam. The enemy did not defeat us. We forced them to the negotiating table and a peace was signed, then our troops were gone by March of 1973.
The clips they love to play over and over of choppers going over the side of a flatop to make room for more are showing VNAF aircraft being discarded. Note the yellow stripes alongside the roundels. Our own choppers were simply evacuating the diplomatic corps and Marine security guard, plus specified Vietnamese nationals.
That was 1975, after Watergate and after the Democrats cut funding and support to the South Vietnamese at the same time Russia and China both doubled their support for the North. American forces won the war, but Congress gave it away.
Let's hope the old bird is given the honors she is truly due ....