I thought for sure I was going to Vietnam after my 18th birthday. I had a low lottery number, and it was 1971, but I was never called.
My dad, who had done three tours in the Special Forces, told me (much) later, that it was winding down at the time.
When I was med-evaced in July 0f 68 the Marines were already being replaced by regular Army and ROK troops... unfortunately our government had probably already realized the war was lost in the American press...