Yes it was.He played "Captain Harris" in Platoon and,IIRC,was also a technical adviser to the producer and/or director of the film.He also played one of General Marshall's aides in Private Ryan.
I can’t imagine these days Captain Dye would have any kind words for Oliver Stone.
And of course, he was Colonel Sink in Band of Brothers.
He actually ran a boot camp that all of the actors in Band of Brothers had to go through before the actual filming started.