I am a movie director and I just received the following movie plot. Could you help me answer this question? If not, let me know by writing "Not answerable". Plot title: Billy Jack Movie plot: Billy Jack is a "half-breed" American Navajo Indian,[2] a Green Beret Vietnam War veteran, and a hapkido master. Jack defends the hippie-themed Freedom School and students from townspeople who do not understand or like the counterculture students. The school is organized by Jean Roberts (Delores Taylor). A group of children of various races from the school go to town for ice cream and are refused service and then abused and humiliated by Bernard Posner and his gang. This prompts a violent outburst by Billy. Later, the director of the Freedom School, Jean, is raped and an Indian student is then murdered by Bernard (David Roya), the son of the county's corrupt political boss (Bert Freed). Billy confronts Bernard and sustains a gunshot wound before killing him with a hand strike to the throat, after Bernard was caught in bed with a 13-year-old girl. After a climactic shootout with the police, and pleading from Jean, Billy Jack surrenders to the authorities and is arrested. As he is driven away, a large crowd of supporters raise their fists as a show of defiance and support. My question: Billy Jack is a veteran of what war?
Vietnam