There should be this disclaimer on every hollyweird war flick- "No actual military or prior service military members were used in the filming or consultation of this movie"
I often see people on other boards ask about the same question which boils down to "what's the big deal with movies showing soldiers in bad light? It's not like people don't know it's just a movie." Wrong. Many people out there have got their only exposure to military life from the movies. Some believe that even if the movie is only half true, it's an accurate representation of our military. They don't realize that outside of all of the film's actors wearing uniforms, any similarity with reality ends there.
Actually, Cpt. Dale Dye has made his name to the point where he actually appears in movies by acting as consultant.
He's done a great number of military movies.
The actors may not have military service, but the big budget war movies, or the ones they want to have any sense of realism always hire people like Dye.