How many US troops were in Vietnam as of March 8 1965?

Approximately 2,594,000 US Servicemen served in Vietnam during the war. This includes the US Marine Corps, US Air Force, US Navy, US Coast Guard, and the US Army. Approximately 2,594,000 US Servicemen served in Vietnam during the war. This includes the US Marine Corps, US Air Force, US Navy, US Coast Guard, and the US Army.