But my impression was that it was more stereotype that Stone was using, since he contrasts William Dafoe's hippie tent playing 'White Rabbit' with the country music playing Tom Berenger's hutch.
Also, he may have overstated his point, since I don't think it was likely that soldiers in front line camps brought their own music with them and relied on Armed Forces radio instead.
But I'd like to hear from 'Nam vets on this one.
I see