John James Rambo is the main protagonist of the Rambo film series and David Morell’s novel First Blood. A former Vietnam veteran and highly skilled Green Beret, Rambo returned from the war as a decorated, but disturbed hero. He is filled with self-loathing and hates killing, but is willing to use his skills to protect those close to him. This is the general plot line of the four First Blood sequels. The main character of the series, Rambo appears in all the films. The only character to come close to this is Sam Trautman, his mentor and commander in Vietnam.