Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
This must be the bloodiest movie I've ever seen. According to IMDB the body count is 466 and most of those people died from bullets that exploded their heads or bombs that sent their limbs flying through the air and right into your face. It should come as no surprise to you that Sylvester Stallone does not believe in subtlety, or that all that violence is why people watch Rambo movies. I wanted to see Rambo as a snake wrangler.
Under the opening credits we see Rambo and two men with snake hooks beside a creek in Thailand, herping for cobras. Rambo finds one, grabs it by the neck and bags it. They bring it to a snake show where we see a man performing with some cobras. We learn that Rambo works there as a professional snake collector and caretaker. We see him argue with his boss, put the cobra in a cage, and throw a rat to a python. It's obvious that he's not happy with the job and his life. (I saw one of those snake shows in Thailand, which confirms that they attract the lowest class of tourist.) This job is supposed to show us how low Rambo has sunk from his glory days as a righteous vigilante mercenary killer, or whatever he was in the previous three Rambo movies, but I probably know some herpers who would consider his snake job to be their dream job. When Rambo is ferrying some merenaries to Burma to rescue some American Good Samaritans held captive by genocidal Burmese soldiers, one of the mercenaries tells him that this action must be better than looking at the ass end of a snake. That gets to Rambo, who starts ripping bad guys throats apart with his bare hands. He inspires the other mercenaries to action by telling them what could be the U.S. Army's recruitment slogan: "Live for nothing or die for something." and the rain of blood, guts, and body parts begins.