Captain Dale Dye served as the film's military adviser and as Captain Harris on screen. He served with the US Marine Corps as a war correspondent and received the Bronze Star Medal for valor and three Purple Hearts.
The last was James Finnerty, serving as the film's key grip. He has a cameo as the pudgy Master Sergeant in the final battle who yells at the two charging North Vietnamese sappers, yelling, "...where the f*ck you going!" before he is shot.