Discounting Airman, Marines, and Sailors: Over 38,000 US Soldiers were killed in Vietnam.
US servicemen returning home from Vietnam were treated with hostility, discrimination, and rejection.
2,555 US Sailors were killed in the Viet War.
Over 58,000 US Servicemen were killed in the Vietnam War.
If your question is about the youngest US Servicemen killed in Vietnam; See: Statistics About the Vietnam War (on line); Recommended by the History Channel.
SEE: Vietnam Veterans Memorial Wall, and Statistics About the Vietnam War (Recommended by the History Channel).
About 38,209 US soldiers were killed in Vietnam. The other dead 20,000 men were Airmen, Marines, and Sailors.
58,220 (est) .
Over 2,000 US helicopter crewmen were KIA in the Vietnam War.
About 25,000 US servicemen 20 and younger were killed in Vietnam.
Approximately 1,971 US Army 1st & 2nd Lieutenants were killed in Vietnam. Approximately 593 US Marine Corps 1st & 2nd LT's were killed. Approximately 171 US Navy Ensigns & LT Junior Grades were killed. Approximately 244 US Air Force 1st & 2nd LT's were killed.
The official number seems to be 58,282.
About 1,492,846 on both sides of the conflict including 58,220 from the US.