President Johnson called the death of James Davis, SP4, US Army "the first American to fall in defense of our freedom in Vietnam." Perhaps the DoD and the CIA had failed to inform him of deaths before Davis died on 22 December 1961. Perhaps the deaths of Advisers or Field Agents in 1954 until then were still classified.
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It will take some heavy research to find out "how many" US servicemen died in the FIRST battle of the war. However, the first LARGE Death Rate occurred in the battle for the Ia Drang in 1965, more than 300 GI's perished there in 3 days of fighting. Only the first part of that battle is depicted in the recent film, "We Were Soldiers Once...", strarring Mel Gibson.
Look at the website: Vietnam Veterans Memorial Wall; those casualties are listed by date.
the first US Military personnel was killed
In America: Soldiers are members of an army. Sailors are members of a navy. Airmen are aviation personnel, normally as members of an Air Force; Marines are Marines and are assigned to the US Navy. Surely you must mean how many US Servicemen were killed in WWII contrasted with the Vietnam War...because there ARE break-down statistics for "Soldier" casualties ONLY; for example, over 58,000 US servicemen were killed in Vietnam...of that figure, about 38,209 were US SOLDIERS. More US servicemen were killed in WWII than Vietnam.
Controversy exists (to no ones surprise) whether the youngest US serviceman killed in Vietnam was 15 or 16 years of age.
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.