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If you're referring to the last person considered a casualty of the Vietnam War, it would be a Marine by the name of Kelton R Turner, who was killed during the Mayaguez Incident. The last name which was added to the wall was that of Marine Gunnery Sergeant Enrique Valdez.
Republic of Vietnam Marine Division was created in 1954.
John Cullington
A Marine Corps Lieutenant in South Vietnam.
Marines are serving in Vietnam today at the U.S. Embassy in HaNoi. But during the war, the embassy guards in SaiGon were Marines through the closing of Embassy operations in April, 1975 - a full two years after U.S. Marine combat units had all left the country.
Marine Heavy Gunner Vietnam - 2004 VG is rated/received certificates of: USA:M
The tour of duty for a US Marine in Vietnam was thirteen months although a Marine could extend his tour in Vietnam .
For the US Army, during the Vietnam War, a battalion was about 600 men. The US Marine Corps will be similar in organization (during the Vietnam era).
The web address of the Marine Corps Vietnam Tankers Historical Foundation is: http://www.mcvthf.org
during 1971
1st Battalion, 9th Marine Regiment
About 391,000 US Marines served in Vietnam. Approximately 14,838 US Marines died. For a breakdown of Divisional casualties; see history of the 3rd Marine Division.