Militant Fanatic is a term used to describe someone who is extremely passionate and devoted to a cause or belief, often to the point of violence. Rambo is a fictional character created by author David Morrell in 1972, who is a former Green Beret and Vietnam War veteran who uses his combat skills to fight for justice. He is an iconic example of a militant fanatic, as he is willing to go to extreme lengths to protect those he loves and fight for what he believes in.