It is extremely hard to watch this movie clearly in modern times. To push aside all the messaging and iconography and effects the later Rambo movies had on culture and just watch this movie on its own terms.
Learning that this movie was originally a 3½ hour mess that got cut down to 90-ish minutes isn't super surprising. So much of what you'd expect to be in a movie like this–backstory, insight into Rambo's psychology, etc...– just isn't there. And…