I dropped down the rabbit hole in 1967. Nineteen years old and on my way to Vietnam as a Marine Corps Corporal. Arriving in-country in early January I was quickly promoted to Sergeant. I served in the Chu Lai TAOR for the next thirteen months.
I climbed out of the rabbit hole in February 1968 (shortly after the Têt Offensive began) and boarded the Freedom Bird back to CONUS. Forever changed and no longer innocent. While in Vietnam life went on in the USA. Here are two videos.