US Military personnel were in Vietnam from 1955 thru 1975.
War in RVN (South Vietnam) since 1955. War with North Vietnam since 1964.
Since 1955.
10 days
two years
Every man did a year.
The Vietnam Syndrome (a nation wide lack of confidence).
As long as he was a US citizen, and as long as he could receive his mail; he was still obligated.
{| |- | The US involvement in Vietnam began in the 60's. The French had been involved in the war for a long time. Vietnam War went forward for a decade. |}
They are still there they were the victors in the war with the US and now rule Vietnam.
The US never invaded Vietnam.
It takes approximately from 8 to 15 days to mail a letter from Vietnam to US. However, it would take 3 days if you used FedEx.