The Memorial is visited by anyone wishing to pay their respects to those who served in Vietnam such as veterans , those who lost a family member in the war , students , etc . . .
Approximately 63,000 men were drafted and about 19,000 of those men served in country in South Vietnam.
To differentiate those who served during the Viet nam war but were not in the war theater
On the site: Vietnam Veterans Memorial Wall; the information column will explain those names.
There were about 14 men who had been injured in Vietnam but somebody within the Department of Defense accidentally selected or transcribed the casualty code for "Dead" into their documents. Those names were carved on the Wall. When it was later discovered the men had come home alive, their names were removed from the printed and electronic directories, but their names were not removed from the Wall because you can not "UN"engrave granite. Those who died or are missing are remembered on the web site named Vietnam Veterans Memorial Virtual Wall, link below.
Over 3,403,100 US Servicemen served in Southeast Asia during the Vietnam War; of those men, 2,594,000 served in country (South Vietnam).
Check the Vietnam Veterans Memorial Wall. Those names are listed in chronological order; the last name engraved on the wall would be your answer.
Jay Leno is certainly in the age group that served in the Vietnam War. He may have had a brother that served in Vietnam; if so, Jay was "relatively" safe from serving in Vietnam. Similiar to actor Chuck Norris, although Mr. Norris did serve in the USAF during those times; unfortunately his brother was KIA while serving with the 101st Abn (Ambl) in Vietnam in 1970.
Approximately 3,403,100 US servicemen served in Southeast Asia (2,594,000 of those men served in country); nearly 60,000 didn't make it back. Those are your "life expectancy" figures.
The website: Vietnam Veterans Memorial Wall, has an information section which answers those questions.
Vietnam War
The website Vietnam Veterans Memorial Wall has a information column that might supply those answers.