One of the few places you'd see mention of our involvement in Viet Nam before late 1964 was in comic books such as Dell's Jungle War Stories. This story is from issue #5, October 1963. Art is by Joe Sinnott and Vince Colletta. The cover is most likely by Vic Prezio
You'll note these are the days before the two most iconic pieces of machinery of the war--the UH-1 helicopter and the M-16 rifle.