While the ending of First Blood was changed because test audiences didn't want to see the character they grew to love die, the sequel pretty much discarded that character anyway and gave us a balls-to-the-wall action horror movie extravaganza. Rambo: First Blood Part II sends John Rambo (blog post) back to Vietnam, to (blog) rescue prisoners of war.. but along the way, he learns something about life. Mostly how to end it by blowing shit up.
Source: Rambo First Blood Part II Movie Review - Decker Shado