Slightly over 58,000
There were no American deaths in Vietnam during the administration of Harry Truman. The first deaths occurred in 1959 under Eisenhower.
If you're asking about a memorial for the American casualties, the answer is "no". There are many memorials to the forces that the north lost, however.
About 1,000,000 men.
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It is estimated that over 3 million people on both sides died during the Vietnam War. The country of Vietnam did not release their casualties to the public until 1995.
Historians estimate, that approximately 200,000 South Vietnamese servicemen of the Army Republic South Vietnam (ARVN), South Vietnamese Marines, Air Force & Navy were killed during the Vietnam War.
58,226 American soldiers
Those statistics are itemized on the "Vietnam War casualties" website.
The website, "Vietnam War casualties" might be helpful.
Over 50,000 Americans were killed and missing in action during the Vietnam War.
A total of 58,168 American soldiers died in Vietnam during the Vietnam War!!
Some sources state about a million.